UNIT-1
HTML – OVERVIEW
HTML stands for Hypertext Markup Language,
and it is the most widely used language to write Web Pages.
Hypertext refers to the way in which Web
pages (HTML documents) are linked together. Thus, the link available on a
webpage is called Hypertext.
As its name suggests, HTML is a Markup Language which
means you use HTML to simply "mark-up" a text document with tags that
tell a Web browser how to structure it to display.
Originally, HTML was developed with the intent of
defining the structure of documents like headings, paragraphs, lists, and so
forth to facilitate the sharing of scientific information between researchers.
Now, HTML is being widely used to format web pages
with the help of different tags available in HTML language.
Basic HTML Document
In its simplest form, following is an example of an
HTML document:
<!DOCTYPE html>
<html>
<head>
<title>This is document title</title>
</head>
<body>
<h1>This is a heading</h1>
<p>Document content goes here.....</p>
</body>
</html>
Either you can use Try it option available at
the top right corner of the code box to check the result of this HTML code, or
let's save it in an HTML file test.htm using your favorite text editor.
Finally open it using a web browser like Internet Explorer or Google Chrome, or
Firefox etc. It must show the following
output:
HTML
Tags
HTML is a markup language and makes use of
various tags to format the content. These tags are enclosed within angle braces
<Tag Name>. Except few tags, most of the tags have their
corresponding closing tags. For example, <html> has its closing
tag</html> and <body> tag has its closing tag </body>
tag etc.
Above
example of HTML document uses the following tags: Tag
|
Description
|
<!DOCTYPE...>
|
This
tag defines the document type and HTML version.
|
<html>
|
This
tag encloses the complete HTML document and mainly comprises of document
header which is represented by <head>...</head> and document body
which is represented by <body>...</body> tags.
|
<head>
|
This
tag represents the document's header which can keep other HTML tags like
<title>, <link> etc.
|
<title>
|
The
<title> tag is used inside the <head> tag to mention the document
title.
|
<body>
|
This
tag represents the document's body which keeps other HTML tags like
<h1>, <div>, <p> etc.
|
<h1>
|
This
tag represents the heading.
|
<p>
|
This
tag represents a paragraph.
|
HTML Document Structure
A typical HTML document will have the following
structure:
Document declaration tag
<html>
<head>
Document header related tags
</head>
<body>
Document body related tags
</body>
</html>
The <!DOCTYPE>
Declaration
The <!DOCTYPE> declaration tag is used by the
web browser to understand the version of the HTML used in the document. Current
version of HTML is 5 and it makes use of the following declaration:
<!DOCTYPE html>
There are many other declaration types which can be
used in HTML document depending on what version of HTML is being used.
HTML – BASIC TAGS
Heading Tags
Any document starts with a heading. You can use
different sizes for your headings. HTML also has six levels of headings, which
use the elements <h1>, <h2>, <h3>, <h4>, <h5>,
and <h6>. While displaying any heading, browser adds one line before
and one line after that heading.
Example
<!DOCTYPE html>
<html>
<head>
<title>Heading Example</title>
</head>
<body>
<h1>This is heading 1</h1>
<h2>This is heading 2</h2>
<h3>This is heading 3</h3>
<h4>This is heading 4</h4>
<h5>This is heading 5</h5>
<h6>This is heading 6</h6>
</body>
</html>
This will produce the following result:
Paragraph
Tag
The
<p> tag offers a way to structure your text into different
paragraphs. Each paragraph of text should go in between an opening <p>
and a closing </p> tag as shown below in the example:
Example
<!DOCTYPE
html>
<html>
<head>
<title>Paragraph
Example</title>
</head>
<body>
<p>Here
is a first paragraph of text.</p>
<p>Here
is a second paragraph of text.</p>
<p>Here
is a third paragraph of text.</p>
</body>
</html>
This will produce the following
result:
Here
is a first paragraph of text.
Here
is a second paragraph of text.
Here
is a third paragraph of text.
Line
Break Tag
Whenever
you use the <br /> element, anything following it starts from the
next line. This tag is an example of an empty element, where you do not
need opening and closing tags, as there is nothing to go in between them.
The
<br /> tag has a space between the characters br and the forward
slash. If you omit this space, older browsers will have trouble rendering the
line break, while if you miss the forward slash character and just use
<br> it is not valid in XHTML.
Example
<!DOCTYPE
html>
<html>
<head>
<title>Line
Break Example</title>
</head>
<body>
<p>Hello<br />
You delivered your assignment on time.<br />
Thanks<br />
Mahnaz</p>
</body>
</html>
This will
produce the following result:
Hello You delivered your assignment on time. Thanks Mahnaz
Centering Content
You can use <center> tag to put any content in
the center of the page or any table cell.
Example
<!DOCTYPE html>
<html>
<head>
<title>Centring Content Example</title>
</head>
<body>
<p>This text is not in the center.</p>
<center>
<p>This text is in the center.</p>
</center>
</body>
</html>
This will
produce the following result:
This text is not in the center.
This text is in the center.
Horizontal Lines
Horizontal lines are used to visually break-up sections of a
document. The <hr> tag creates a line from the current position in
the document to the right margin and breaks the line accordingly.
For example, you may want to give a line between two
paragraphs as in the given example below:
Example
<!DOCTYPE html>
<html>
<head>
<title>Horizontal Line Example</title>
</head>
<body>
<p>This is paragraph one and should be on top</p>
<hr />
<p>This is paragraph two and should be at
bottom</p>
</body>
</html>
This will
produce the following result:
This is paragraph one and should be on top
This is paragraph two and should be at bottom
Again <hr /> tag is an example of the empty element,
where you do not need opening and closing tags, as there is nothing to go in
between them.
The <hr /> element has a space between the
characters hr and the forward slash. If you omit this space, older
browsers will have trouble rendering the horizontal line, while if you miss the
forward slash character and just use <hr> it is not valid in XHTML
Preserve Formatting
Sometimes, you want your text to follow the exact format of
how it is written in the HTML document. In these cases, you can use the
preformatted tag <pre>.
Any text between the opening <pre> tag and the
closing </pre> tag will preserve the formatting of the source
document.
Example
<!DOCTYPE html>
<html>
<head> <title>Preserve Formatting
Example</title>
</head>
<body>
<pre>
function testFunction( strText ){
alert (strText)
}
</pre>
</body>
</html>
This will produce the following result:
function testFunction( strText ){
alert (strText)
}
Try using the same code without keeping it inside <pre>...</pre>
tags
Non-Breaking Spaces
Suppose you want to use the phrase "12 Angry Men."
Here, you would not want a browser to split the "12, Angry" and
"Men" across two lines:
An example of this technique appears in the movie "12
Angry Men."
In cases, where you do not want the client browser to break
text, you should use a nonbreaking space entity instead of a
normal space. For example, when coding the "12 Angry Men" in a
paragraph, you should use something similar to the following code:
Example
<!DOCTYPE html>
<html>
<head>
<title>Nonbreaking Spaces Example</title>
</head>
<body>
<p>An example of this technique appears in the movie
"12 Angry Men."</p>
</body>
</html>
HTML – ELEMENTS
An HTML element is defined by a starting tag.
If the element contains other content, it ends with a closing tag, where the
element name is preceded by a forward slash as shown below with few tags: Start
Tag
|
Content
|
End Tag
|
<p>
|
This is paragraph content.
|
</p>
|
<h1>
|
This is heading content.
|
</h1>
|
<div>
|
This is division content.
|
</div>
|
<br />
|
So here <p>....</p> is an HTML
element, <h1>...</h1> is another HTML element. There are
some HTML elements which don't need to be closed, such as <img.../>,
<hr /> and <br /> elements. These are known as void
elements.
HTML documents consists of a tree of these elements
and they specify how HTML documents should be built, and what kind of content
should be placed in what part of an HTML document.
HTML Tag vs. Element
An HTML element is defined by a starting tag.
If the element contains other content, it ends with a closing tag.
For example, <p> is starting tag of a
paragraph and </p> is closing tag of the same paragraph but <p>This
is paragraph</p> is a paragraph element.
Nested HTML Elements
It is very much allowed to keep one HTML element
inside another HTML element:
Example
<!DOCTYPE html>
<html>
<head> <title>Nested Elements
Example</title>
</head>
<body>
<h1>This is <i>italic</i> heading</h1>
<p>This is <u>underlined</u> paragraph</p>
</body>
</html>
This
will display the following result:
This is italic heading
This is underlined paragraph
HTML – ATTRIBUTES
We have seen few HTML tags and their usage like
heading tags <h1>, <h2>, paragraph tag <p> and
other tags. We used them so far in their simplest form, but most of the HTML
tags can also have attributes, which are extra bits of information.
An attribute is used to define the characteristics of
an HTML element and is placed inside the element's opening tag. All attributes
are made up of two parts: a name and a value:
The name is the property you want to set. For
example, the paragraph <p> element in the example carries an
attribute whose name is align, which you can use to indicate the
alignment of paragraph on the page.
The value is what you want the value of the
property to be set and always put within quotations. The below example shows
three possible values of align attribute: left, center and right.
Attribute names and attribute values are
case-insensitive. However, the World Wide Web Consortium (W3C) recommends
lowercase attributes/attribute values in their HTML 4 recommendation.
Example
<!DOCTYPE html>
<html>
<head>
<title>Align Attribute Example</title>
</head>
<body>
<p align="left">This is left
aligned</p>
<p align="center">This is center
aligned</p>
<p align="right">This is right
aligned</p>
</body>
</html>
This will display the following result:
This is left aligned
This is center aligned
This is right aligned
Core Attributes
The four core attributes that can be used on the majority of HTML
elements (although not all) are:
Id
Title
Class
Style
The Id Attribute
The id attribute of an HTML tag can be used to uniquely
identify any element within an HTML page. There are two primary reasons that
you might want to use an id attribute on an element:
If an element carries an id attribute as a unique identifier, it
is possible to identify just that element and its content.
If you have two elements of the same name within a Web page (or
style sheet), you can use the id attribute to distinguish between elements that
have the same name.
We will discuss style sheet in separate tutorial. For now, let's
use the id attribute to distinguish between two paragraph elements as shown
below.
Example
<p id="html">This para explains what is
HTML</p>
<p id="css">This para explains what is Cascading
Style Sheet</p>
The title Attribute
The title attribute gives a suggested title for the
element. They syntax for the title attribute is similar as explained for
id attribute:
The behavior of this attribute will depend upon the element that
carries it, although it is often displayed as a tooltip when cursor comes over
the element or while the element is loading.
Example
<!DOCTYPE html>
<html>
<head>
<title>The title Attribute Example</title>
</head>
<body>
<h3 title="Hello HTML!">Titled Heading Tag
Example</h3>
</body>
</html>
This
will produce the following result:
Titled Heading Tag Example
Now try to bring your cursor over "Titled Heading Tag
Example" and you will see that whatever title you used in your code is
coming out as a tooltip of the cursor.
The class Attribute
The class attribute is used to associate an element with a
style sheet, and specifies the class of element. You will learn more about the
use of the class attribute when you will learn Cascading Style Sheet (CSS). So
for now you can avoid it.
The value of the attribute may also be a space-separated list of
class names. For example:
class="className1 className2 className3"
The style Attribute
The style attribute allows you to specify Cascading Style Sheet
(CSS) rules within the element.
<!DOCTYPE html>
<html>
<head>
<title>The style Attribute</title>
</head>
<body>
<p style="font-family:arial; color:#FF0000;">Some
text...</p>
</body>
</html>
This
will produce the following result:
Some text...
At this point of time, we are not learning CSS, so just let's
proceed without bothering much about CSS. Here, you need to understand what are
HTML attributes and how they can be used while formatting content.
Internationalization Attributes
There are three internationalization attributes, which are
available for most (although not all) XHTML elements
dir
lang
xml:lang
The
dir Attribute
The dir attribute allows you to indicate to the
browser about the direction in which the text should flow. The dir attribute
can take one of two values, as you can see in the table that follows:
Value
|
Meaning
|
ltr
|
Left to right (the default value)
|
rtl
|
Right to left (for languages such as Hebrew or
Arabic that are read right to left)
|
Example
<!DOCTYPE
html>
<html
dir="rtl">
<head>
<title>Display
Directions</title>
</head>
<body>
This
is how IE 5 renders right-to-left directed text.
</body>
</html>
This
will produce the following result:
This
is how IE 5 renders right-to-left directed text.
When
dir attribute is used within the <html> tag, it determines how
text will be presented within the entire document. When used within another
tag, it controls the text's direction for just the content of that tag.
The
lang Attribute
The
lang attribute allows you to indicate the main language used in a
document, but this attribute was kept in HTML only for backwards compatibility
with earlier versions of HTML. This attribute has been replaced by the xml:lang
attribute in new XHTML documents.
The values of the lang attribute are ISO-639
standard two-character language codes. Check HTML Language Codes: ISO 639 for
a complete list of language codes.
Example
<!DOCTYPE
html>
<html lang="en">
<head>
<title>English Language Page</title>
</head>
<body>
This page is using English Language
</body>
</html>
The
xml:lang Attribute
The
xml:lang attribute is the XHTML replacement for the lang attribute.
The value of thexml:lang attribute should be an ISO-639 country code as
mentioned in previous section.
Generic
Attributes
Here's a table of some other attributes that are readily
usable with many of the HTML tags.
Attribute
|
Options
|
Function
|
align
|
right, left, center
|
Horizontally aligns tags
|
valign
|
top, middle, bottom
|
Vertically aligns tags within an HTML element.
|
bgcolor
|
numeric, hexidecimal, RGB values
|
Places a background color behind an element
|
background
|
URL
|
Places a background image behind an element
|
id
|
User Defined
|
Names an element for use with Cascading Style
Sheets.
|
class
|
User Defined
|
Classifies an element for use with Cascading Style
Sheets.
|
width
|
Numeric Value
|
Specifies the width of tables, images, or table
cells.
|
height
|
Numeric Value
|
Specifies the height of tables, images, or table
cells.
|
title
|
User Defined
|
"Pop-up" title of the elements.
|
We will see related examples as we will proceed to study
other HTML tags. For a complete list of HTML Tags and related attributes please
check reference to HTML Tags List.
HTML – FORMATTING
If you use a word processor, you must be familiar with
the ability to make text bold, italicized, or underlined; these are just three
of the ten options available to indicate how text can appear in HTML and XHTML.
Bold Text
Anything that appears within <b>...</b>
element, is displayed in bold as shown below:
Example
<!DOCTYPE html>
<html>
<head>
<title>Bold Text Example</title>
</head>
<body>
<p>The following word uses a
<b>bold</b> typeface.</p>
</body>
</html>
This will
produce the following result:
The following word uses a bold typeface.
Italic
Text
Anything
that appears within <i>...</i> element is displayed in
italicized as shown below:
Example
<!DOCTYPE html>
<html>
<head>
<title>Italic Text Example</title>
</head>
<body>
<p>The following word uses a
<i>italicized</i> typeface.</p>
</body>
</html>
This will
produce the following result:
The following word uses an italicized typeface.
Underlined
Text
Anything
that appears within <u>...</u> element, is displayed with
underline as shown below:
Example
<!DOCTYPE html>
<html>
<head>
<title>Underlined Text Example</title>
</head>
<body>
<p>The following word uses a
<u>underlined</u> typeface.</p>
</body>
</html>
This will produce the following result:
The following word uses an underlined typeface.
Strike Text
Anything that appears within <strike>...</strike>
element is displayed with strikethrough, which is a thin line through the
text as shown below:
Example
<!DOCTYPE html>
<html>
<head>
<title>Strike Text Example</title>
</head>
<body>
<p>The following word uses a
<strike>strikethrough</strike> typeface.</p>
</body>
</html>
This will produce the following
result:
The
following word uses a strikethrough typeface.
Monospaced
Font
The
content of a <tt>...</tt> element is written in monospaced
font. Most of the fonts are known as variable-width fonts because different
letters are of different widths (for example, the letter 'm' is wider than the
letter 'i'). In a monospaced font, however, each letter has the same width.
Example
<!DOCTYPE html>
<html>
<head>
<title>Monospaced Font Example</title>
</head>
<body>
<p>The following word uses a
<tt>monospaced</tt> typeface.</p>
</body>
</html>
This will
produce the following result:
The following word uses a monospaced typeface.
Superscript
Text
The
content of a <sup>...</sup> element is written in
superscript; the font size used is the same size as the characters surrounding
it but is displayed half a character's height above the other characters.
Example
<!DOCTYPE html>
<html>
<head>
<title>Superscript Text Example</title>
</head>
<body>
<p>The following word uses a
<sup>superscript</sup> typeface.</p>
</body>
</html>
This will produce the following result:
The following word uses a superscript typeface.
Subscript
Text
The
content of a <sub>...</sub> element is written in subscript;
the font size used is the same as the characters surrounding it, but is
displayed half a character's height beneath the other characters.
Example
<!DOCTYPE
html>
<html>
<head>
<title>Subscript
Text Example</title>
</head>
<body>
<p>The
following word uses a <sub>subscript</sub> typeface.</p>
</body>
</html>
This will produce the following
result:
The following word uses a subscript typeface.
Inserted
Text
Anything
that appears within <ins>...</ins> element is displayed as
inserted text.
Example
<!DOCTYPE
html>
<html>
<head>
<title>Inserted
Text Example</title>
</head>
<body>
<p>I
want to drink <del>cola</del> <ins>wine</ins></p>
</body
</html>
This will
produce the following result:
Deleted
Text
Anything
that appears within <del>...</del> element, is displayed as
deleted text.
Example
<!DOCTYPE
html>
<html>
<head>
<title>Deleted
Text Example</title>
</head>
<body>
<p>I
want to drink <del>cola</del> <ins>wine</ins></p>
</body>
</html>
This will
produce the following result:
Larger
Text
The
content of the <big>...</big> element is displayed one font
size larger than the rest of the text surrounding it as shown below:
Example
<!DOCTYPE
html>
<html>
<head>
<title>Larger
Text Example</title>
</head>
<body>
<p>The
following word uses a <big>big</big> typeface.</p>
</body>
</html>
This will
produce the following result:
The following word uses a big typeface.
Smaller Text
The content of the <small>...</small> element
is displayed one font size smaller than the rest of the text surrounding it as
shown below:
Example
<!DOCTYPE html>
<html>
<head>
<title>Smaller Text Example</title>
</head>
<body>
<p>The following word uses a
<small>small</small> typeface.</p>
</body>
</html>
This will produce the following result:
The following word uses a small typeface.
Grouping
Content
The
<div> and <span> elements allow you to group together
several elements to create sections or subsections of a page.
For
example, you might want to put all of the footnotes on a page within a
<div> element to indicate that all of the elements within that
<div> element relate to the footnotes. You might then attach a style to
this <div> element so that they appear using a special set of style
rules.
Example
<!DOCTYPE html>
<html>
<head>
<title>Div Tag Example</title>
</head>
<body>
<div id="menu" align="middle" >
<a href="/index.htm">HOME</a> |
<a href="/about/contact_us.htm">CONTACT</a>
|
<a href="/about/index.htm">ABOUT</a>
</div>
<div id="content" align="left"
bgcolor="white">
<h5>Content Articles</h5>
<p>Actual content goes here.....</p>
</div>
</body>
</html>
This
will produce the following result:
HOME | CONTACT | ABOUT
CONTENT
ARTICLES
Actual
content goes here.....
The <span> element, on the other hand, can be used
to group inline elements only. So, if you have a part of a sentence or
paragraph which you want to group together, you could use the <span>
element as follows
Example
<!DOCTYPE
html>
<html>
<head>
<title>Span
Tag Example</title>
</head>
<body>
<p>This
is the example of <span style="color:green">span
tag</span> and the <span style="color:red">div
tag</span> alongwith CSS</p>
</body>
</html>
This
will produce the following result:
This
is the example of span tag and the div tag along with CSS
These tags are commonly used with CSS to allow you to
attach a style to a section of a page.
HTML – COMMENTS
Comment is a piece of code which is ignored by any web
browser. It is a good practice to add comments into your HTML code, especially
in complex documents, to indicate sections of a document, and any other notes
to anyone looking at the code. Comments help you and others understand your
code and increases code readability.
HTML comments are placed in between <!-- ...
--> tags. So, any content placed with-in <!-- ... --> tags will be
treated as comment and will be completely ignored by the browser.
Example
<!DOCTYPE html>
<html>
<head> <!-- Document Header Starts -->
<title>This is document title</title>
</head> <!-- Document Header Ends -->
<body>
<p>Document content goes here.....</p>
</body>
</html>
This will produce result without displaying the
content given as a part of comments:
Document content goes here.....
Valid vs Invalid Comments
Comments do not nest which means a comment cannot be
put inside another comment. Second the double-dash sequence "--" may
not appear inside a comment except as part of the closing --> tag. You must
also make sure that there are no spaces in the start-of-comment string.
Example
Here, the given comment is a valid comment and will be
wiped off by the browser.
<!DOCTYPE html>
<html>
<head>
<title>Valid Comment Example</title>
</head>
<body>
<!-- This is valid comment -->
<p>Document content goes here.....</p>
</body>
</html>
But, following line is not a valid comment and will be displayed
by the browser. This is because there is a space between the left angle bracket
and the exclamation mark.
<!DOCTYPE html>
<html>
<head>
<title>Invalid Comment Example</title>
</head>
<body>
< !-- This is not a valid comment -->
<p>Document content goes here.....</p>
</body>
</html>
This will produce the following result:
< !-- This is not a valid comment -->
Document content goes here.....
Multiline Comments
So far we have seen single line comments, but HTML supports
multi-line comments as well.
You can comment multiple lines by the special beginning tag
<!-- and ending tag --> placed before the first line and end of the last
line as shown in the given example below.
Example
<!DOCTYPE html><html>
<head>
<title>Multiline Comments</title>
</head>
<body>
<!--
This is a multiline comment and it can
span through as many as lines you like. -->
<p>Document content goes here.....</p>
</body>
</html>
This
will produce the following result:
Document content goes here.....
Conditional Comments
Conditional comments only work in Internet Explorer (IE) on
Windows but they are ignored by other browsers. They are supported from
Explorer 5 onwards, and you can use them to give conditional instructions to
different versions of IE.
Example
<!DOCTYPE html><html>
<head>
<title>Conditional Comments</title>
<!--[if IE 6]>
Special instructions for IE 6 here
<![endif]-->
</head>
<body>
<p>Document content goes here.....</p>
</body>
</html>
You will come across a situation where you will need to apply a
different style sheet based on different versions of Internet Explorer, in such
situation conditional comments will be helpful.
Using Comment Tag
There are few browsers that support <comment> tag to comment
a part of HTML code.
Example
<!DOCTYPE html><html>
<head>
<title>Using Comment Tag</title>
</head>
<body>
<p>This is <comment>not</comment> Internet
Explorer.</p>
</body>
</html>
If you are using IE, then it will produce following result:
This is Internet Explorer.
But if you are not using IE, then it will produce following
result:
This is Internet Explorer.
Commenting Script Code
Though you will learn JavaScript with HTML, in a separate
tutorial, but here you must make a note that if you are using Java Script or VB
Script in your HTML code then it is recommended to put that script code inside
proper HTML comments so that old browsers can work properly.
Example
<!DOCTYPE html><html>
<head>
<title>Commenting Script Code</title>
<script>
<!--
document.write("Hello World!")
//-->
</script>
</head>
<body>
<p>Hello , World!</p>
</body>
</html>
This will produce the following result:
Hello World!
Hello , World!
Commenting Style Sheets
Though you will learn using style sheets with HTML in a separate
tutorial, but here you must make a note that if you are using Cascading Style
Sheet (CSS) in your HTML code then it is recommended to put that style sheet
code inside proper HTML comments so that old browsers can work properly.
Example
<!DOCTYPE html><html>
<head>
<title>Commenting Style Sheets</title>
<style>
<!--
.example {
border:1px solid #4a7d49;
}
//-->
</style>
</head>
<body>
<div class="example">Hello , World!</div>
</body>
</html>
This
will produce the following result:
Hello, World!
HTML – IMAGES
Images are very important to beautify as well as to
depict many complex concepts in simple way on your web page. This tutorial will
take you through simple steps to use images in your web pages.
Insert Image
You can insert any image in your web page by using <img>
tag. Following is the simple syntax to use this tag.
<img src="Image URL" ...
attributes-list/>
The <img> tag is an empty tag, which means that,
it can contain only list of attributes and it has no closing tag.
Example
To try following example, let's keep our HTML file
test.htm and image file test.png in the same directory:
<!DOCTYPE html>
<html>
<head>
<title>Using Image in Webpage</title>
</head>
<body>
<p>Simple Image Insert</p>
<img src="test.png" alt="Test
Image" />
</body>
</html>
This will produce the following result:
Simple Image Insert
You can use PNG, JPEG or GIF image file based on your
comfort but make sure you specify correct image file name in src attribute.
Image name is always case sensitive. The alt attribute is a
mandatory attribute which specifies an alternate text for an image, if the
image cannot be displayed.
Set Image Location
Usually we keep all the images in a separate directory. So let's
keep HTML file test.htm in our home directory and create a subdirectory images
inside the home directory where we will keep our image test.png.
Example
Assuming our image location is "image/test.png", try the
following example:
<!DOCTYPE html>
<html>
<head>
<title>Using Image in Webpage</title>
</head>
<body>
<p>Simple Image Insert</p>
<img src="images/test.png" alt="Test Image"
/>
</body>
</html>
This
will produce the following result:
Simple Image Insert
Set Image Width/Height
You can set image width and height based on your requirement using
width and height attributes. You can specify width and height of
the image in terms of either pixels or percentage of its actual size.
Example
<!DOCTYPE html>
<html>
<head>
<title>Set Image Width and Height</title>
</head>
<body>
<p>Setting image width and height</p>
<img src="test.png" alt="Test Image"
width="150" height="100"/>
</body>
</html>
This
will produce the following result:
Setting image width and height
Set Image Border
By default, image will have a border around it, you can specify
border thickness in terms of pixels using border attribute. A thickness of 0
means, no border around the picture.
Example
<!DOCTYPE html>
<html>
<head>
<title>Set Image Border</title>
</head>
<body>
<p>Setting image Border</p>
<img src="test.png" alt="Test Image"
border="3"/>
</body>
</html>
This
will produce the following result:
Setting image Border
Set Image Alignment
By default, image will align at the left side of the page, but you
can use align attribute to set it in the center or right.
Example
<!DOCTYPE html>
<html>
<head>
<title>Set Image Alignment</title>
</head>
<body>
<p>Setting image Alignment</p>
<img src="test.png" alt="Test Image"
border="3" align="right"/>
</body>
</html>
This
will produce the following result:
Setting image Alignment
HTML – TABLES
The HTML tables allow web authors to arrange data like
text, images, links, other tables, etc. into rows and columns of cells.
The HTML tables are created using the <table>
tag in which the <tr> tag is used to create table rows and <td>
tag is used to create data cells.
Example
<!DOCTYPE html>
<html>
<head>
<title>HTML Tables</title>
</head>
<body>
<table border="1">
<tr>
<td>Row 1, Column 1</td>
<td>Row 1, Column 2</td>
</tr>
<tr>
<td>Row 2, Column 1</td>
<td>Row 2, Column 2</td>
</tr>
</table>
</body>
</html>
This will
produce the following result:
Row 1, Column 1
|
Row 1, Column 2
|
Row 2, Column 1
|
Row 2, Column 2
|
Here, the border is an attribute of
<table> tag and it is used to put a border across all the cells. If you
do not need a border, then you can use border="0".
Table Heading
Table heading can be defined using <th> tag. This tag
will be put to replace <td> tag, which is used to represent actual data
cell. Normally you will put your top row as table heading as shown below,
otherwise you can use <th> element in any row.
Example
<!DOCTYPE html>
<html>
<head>
<title>HTML Table Header</title>
</head>
<body>
<table border="1">
<tr>
<th>Name</th>
<th>Salary</th>
</tr>
<tr>
<td>Ramesh Raman</td>
<td>5000</td>
</tr>
<tr>
<td>Shabbir Hussein</td>
<td>7000</td>
</tr>
</table>
</body>
</html>
This
will produce the following result:
Name
|
Salary
|
Ramesh Raman
|
5000
|
Shabbir Hussein
|
7000
|
Cellpadding
and Cellspacing Attributes
There
are two attributes called cellpadding and cellspacing which you
will use to adjust the white space in your table cells. The cellspacing
attribute defines the width of the border, while cellpadding represents the
distance between cell borders and the content within a cell.
Example
<!DOCTYPE
html>
<html>
<head>
<title>HTML
Table Cellpadding</title>
</head>
<body>
<table
border="1" cellpadding="5" cellspacing="5">
<tr>
<th>Name</th>
<th>Salary</th>
</tr>
<tr>
<td>Ramesh
Raman</td>
<td>5000</td>
</tr>
<tr>
<td>Shabbir
Hussein</td>
<td>7000</td>
</tr>
</table>
</body>
</html>
This will
produce the following result:
Name
|
Salary
|
Ramesh Raman
|
5000
|
Shabbir Hussein
|
7000
|
Colspan
and Rowspan Attributes
You
will use colspan attribute if you want to merge two or more columns into
a single column. Similar way you will use rowspan if you want to merge
two or more rows.
Example
<!DOCTYPE
html>
<html>
<head>
<title>HTML
Table Colspan/Rowspan</title>
</head>
<body>
<table
border="1">
<tr>
<th>Column
1</th>
<th>Column
2</th>
<th>Column
3</th>
</tr>
<tr><td
rowspan="2">Row 1 Cell 1</td><td>Row 1 Cell
2</td><td>Row 1 Cell 3</td></tr>
<tr><td>Row
2 Cell 2</td><td>Row 2 Cell 3</td></tr>
<tr><td
colspan="3">Row 3 Cell 1</td></tr>
</table>
</body>
</html>
This will
produce the following result:
Column 1
|
Column 2
|
Column 3
|
|
Row 1 Cell 1
|
Row 1 Cell 2
|
Row 1 Cell 3
|
|
Row 2 Cell 2
|
Row 2 Cell 3
|
||
Row 3 Cell 1
|
|||
Tables
Backgrounds
You
can set table background using one of the following two ways:
bgcolor attribute - You can set background color for whole table or just
for one cell.
background attribute - You can set background image
for whole table or just for one cell.
You can also set border color also using bordercolor attribute.
Example
<!DOCTYPE html>
<html>
<head>
<title>HTML Table Background</title>
</head>
<body>
<table border="1" bordercolor="green"
bgcolor="yellow">
<tr>
<th>Column 1</th>
<th>Column 2</th>
<th>Column 3</th>
</tr>
<tr><td rowspan="2">Row 1 Cell
1</td><td>Row 1 Cell 2</td><td>Row 1 Cell
3</td></tr>
<tr><td>Row 2 Cell 2</td><td>Row 2
Cell 3</td></tr>
<tr><td colspan="3">Row 3 Cell
1</td></tr>
</table>
</body>
</html>
This will produce
the following result:
Column 1
|
Column 2
|
Column 3
|
|
Row 1 Cell 1
|
Row 1 Cell 2
|
Row 1 Cell 3
|
|
Row 2 Cell 2
|
Row 2 Cell 3
|
||
Row 3 Cell 1
|
|||
Here is an example of using background attribute.
Here we will use an image available in /images directory.
<!DOCTYPE html>
<html>
<head>
<title>HTML Table Background</title>
</head>
<body>
<table border="1" bordercolor="green"
background="/images/test.png">
<tr>
<th>Column 1</th>
<th>Column 2</th>
<th>Column 3</th>
</tr>
<tr><td rowspan="2">Row 1 Cell
1</td><td>Row 1 Cell 2</td><td>Row 1 Cell
3</td></tr>
<tr><td>Row 2 Cell 2</td><td>Row 2 Cell
3</td></tr>
<tr><td colspan="3">Row 3 Cell
1</td></tr>
</table>
</body>
</html>
This
will produce the following result.
Here background image did not apply to table's header.
Column 1
|
Column 2
|
Column 3
|
|
Row 1 Cell 1
|
Row 1 Cell 2
|
Row 1 Cell 3
|
|
Row 2 Cell 2
|
Row 2 Cell 3
|
||
Row 3 Cell 1
|
|||
Table
Height and Width
You
can set a table width and height using width and height attributes.
You can specify table width or height in terms of pixels or in terms of
percentage of available screen area.
Example
<!DOCTYPE
html>
<html>
<head>
<title>HTML
Table Width/Height</title>
</head>
<body>
<table
border="1" width="400" height="150">
<tr>
<td>Row 1, Column 1</td>
<td>Row 1, Column 2</td>
</tr>
<tr>
<td>Row 2, Column 1</td>
<td>Row 2, Column 2</td>
</tr>
</table>
</body>
</html>
This will
produce the following result:
Row 1, Column 1
|
Row 1, Column 2
|
Row 2, Column 1
|
Row 2, Column 2
|
Table
Caption
The
caption tag will serve as a title or explanation for the table and it
shows up at the top of the table. This tag is deprecated in newer version of
HTML/XHTML.
Example
<!DOCTYPE
html>
<html>
<head>
<title>HTML
Table Caption</title>
</head>
<body>
<table
border="1" width="100%">
<caption>This
is the caption</caption>
<tr>
<td>row
1, column 1</td><td>row 1, column 2</td>
</tr>
<tr>
<td>row
2, column 1</td><td>row 2, column 2</td>
</tr>
</table>
</body>
</html>
This will
produce the following result:
This is the caption
|
|
row 1, column 1
|
row 1, column 2
|
row 2, column 1
|
row 2, column 2
|
Table
Header, Body, and Footer
Tables
can be divided into three portions: a header, a body, and a foot. The head and
foot are rather similar to headers and footers in a word-processed document
that remain the same for every page, while the body is the main content holder
of the table.
The
three elements for separating the head, body, and foot of a table are:
<thead> - to
create a separate table header.
<tbody> - to
indicate the main body of the table.
<tfoot> - to create a separate table footer.
A
table may contain several <tbody> elements to indicate different pages
or groups of data. But it is notable that <thead> and <tfoot>
tags should appear before <tbody>
Example
<!DOCTYPE
html>
<html>
<head>
<title>HTML
Table</title>
</head>
<body>
<table
border="1" width="100%">
<thead>
<tr>
<td
colspan="4">This is the head of the table</td>
</tr>
</thead>
<tfoot>
<tr>
<td
colspan="4">This is the foot of the table</td>
</tr>
</tfoot>
<tbody>
<tr>
<td>Cell 1</td>
<td>Cell 2</td>
<td>Cell 3</td>
<td>Cell 4</td>
</tr>
</tbody>
</table>
</body>
</html>
This will
produce the following result:
This is the head of the table
|
|||
This is the foot of the table
|
|||
Cell 1
|
Cell 2
|
Cell 3
|
Cell 4
|
Nested
Tables
You
can use one table inside another table. Not only tables you can use almost all
the tags inside table data tag <td>.
Example
Following
is the example of using another table and other tags inside a table cell.
<!DOCTYPE
html>
<html>
<head>
<title>HTML
Table</title>
</head>
<body>
<table
border="1" width="100%">
<tr>
<td>
<table
border="1" width="100%">
<tr>
<th>Name</th>
<th>Salary</th>
</tr>
<tr>
<td>Ramesh Raman</td>
<td>5000</td>
</tr>
<tr>
<td>Shabbir Hussein</td>
<td>7000</td>
</tr>
</table>
</td>
</tr>
</table>
</body>
</html>
This will
produce the following result:
Name
|
Salary
|
|
Ramesh
Raman
|
5000
|
|
Shabbir
Hussein
|
7000
|
|
UNIT-2
HTML – LISTS
HTML offers web authors three ways for specifying
lists of information. All lists must contain one or more list elements. Lists
may contain:
<ul> - An unordered list. This will
list items using plain bullets.
<ol> - An ordered list. This will use
different schemes of numbers to list your items.
<dl> - A definition list. This arranges
your items in the same way as they are arranged in a dictionary.
HTML Unordered Lists
An unordered list is a collection of related items
that have no special order or sequence. This list is created by using HTML <ul>
tag. Each item in the list is marked with a bullet.
Example
<!DOCTYPE html>
<html>
<head>
<title>HTML Unordered List</title>
</head>
<body>
<ul>
<li>Beetroot</li>
<li>Ginger</li>
<li>Potato</li>
<li>Radish</li>
</ul>
</body>
</html>
This will produce the following result:
Beetroot
Ginger
Potato
Radish
The type Attribute
You can use type attribute for <ul> tag to specify
the type of bullet you like. By default, it is a disc. Following are the
possible options:
<ul type="square">
<ul type="disc">
<ul type="circle">
Example
Following is an example where we used <ul
type="square">
<!DOCTYPE html>
<html>
<head>
<title>HTML Unordered List</title>
</head>
<body>
<ul type="square">
<li>Beetroot</li>
<li>Ginger</li>
<li>Potato</li>
<li>Radish</li>
</ul>
</body>
</html>
This
will produce the following result:
Beetroot
Ginger
Potato
Radish
Example
Following is an example where we used <ul
type="disc">:
<!DOCTYPE html>
<html>
<head>
<title>HTML Unordered List</title>
</head>
<body>
<ul type="disc">
<li>Beetroot</li>
<li>Ginger</li>
<li>Potato</li>
<li>Radish</li>
</ul>
</body>
</html>
This
will produce the following result:
Beetroot
Ginger
Potato
Radish
Example
Following is an example where we used <ul
type="circle">:
<!DOCTYPE html>
<html>
<head>
<title>HTML Unordered List</title>
</head>
<body>
<ul type="circle">
<li>Beetroot</li>
<li>Ginger</li>
<li>Potato</li>
<li>Radish</li>
</ul>
</body>
</html>
This
will produce the following result:
Beetroot
Ginger
Potato
Radish
HTML Ordered Lists
If you are required to put your items in a numbered list instead
of bulleted, then HTML ordered list will be used. This list is created by using
<ol> tag. The numbering starts at one and is incremented by one
for each successive ordered list element tagged with <li>.
Example
<!DOCTYPE html>
<html>
<head>
<title>HTML Ordered List</title>
</head>
<body>
<ol>
<li>Beetroot</li>
<li>Ginger</li>
<li>Potato</li>
<li>Radish</li>
</ol>
</body>
</html>
This
will produce the following result:
Beetroot
Ginger
Potato
Radish
The type Attribute
You can use type attribute for <ol> tag to specify
the type of numbering you like. By default, it is a number. Following are the
possible options:
<ol type="1"> - Default-Case Numerals.
<ol type="I"> - Upper-Case Numerals.
<ol type="i"> - Lower-Case Numerals.
<ol type="a"> - Lower-Case Letters.
<ol type="A"> - Upper-Case Letters.
Example
Following is an example where we used <ol
type="1">
<!DOCTYPE html>
<html>
<head>
<title>HTML Ordered List</title>
</head>
<body>
<ol type="1">
<li>Beetroot</li>
<li>Ginger</li>
<li>Potato</li>
<li>Radish</li>
</ol>
</body>
</html>
This
will produce the following result:
Beetroot
Ginger
Potato
Radish
Example
Following is an example where we used <ol
type="I">
<!DOCTYPE html>
<html>
<head>
<title>HTML Ordered List</title>
</head>
<body>
<ol type="I">
<li>Beetroot</li>
<li>Ginger</li>
<li>Potato</li>
<li>Radish</li>
</ol>
</body>
</html>
This
will produce the following result:
Beetroot
Ginger
Potato
Radish
Example
Following is an example where we used <ol
type="i">
<!DOCTYPE html>
<html>
<head>
<title>HTML Ordered List</title>
</head>
<body>
<ol type="i">
<li>Beetroot</li>
<li>Ginger</li>
<li>Potato</li>
<li>Radish</li>
</ol>
</body>
</html>
This
will produce the following result:
Beetroot
Ginger
Potato
Radish
Example
Following is an example where we used <ol
type="A">
<!DOCTYPE html>
<html>
<head>
<title>HTML Ordered List</title>
</head>
<body>
<ol type="A">
<li>Beetroot</li>
<li>Ginger</li>
<li>Potato</li>
<li>Radish</li>
</ol>
</body>
</html>
This
will produce the following result:
Beetroot
Ginger
Potato
Radish
Example
Following is an example where we used <ol
type="a">
<!DOCTYPE html>
<html>
<head>
<title>HTML Ordered List</title>
</head>
<body>
<ol type="a">
<li>Beetroot</li>
<li>Ginger</li>
<li>Potato</li>
<li>Radish</li>
</ol>
</body>
</html>
This
will produce the following result:
Beetroot
Ginger
Potato
Radish
The start Attribute
You can use start attribute for <ol> tag to specify
the starting point of numbering you need. Following are the possible options:
<ol type="1" start="4"> - Numerals
starts with 4.
<ol type="I" start="4"> - Numerals
starts with IV.
<ol type="i" start="4"> - Numerals
starts with iv.
<ol type="a" start="4"> - Letters starts
with d.
<ol type="A" start="4"> - Letters starts
with D.
Example
Following is an example where we used <ol type="i"
start="4" >
<!DOCTYPE html>
<html>
<head>
<title>HTML Ordered List</title>
</head>
<body>
<ol type="i" start="4">
<li>Beetroot</li>
<li>Ginger</li>
<li>Potato</li>
<li>Radish</li>
</ol>
</body>
</html>
This
will produce the following result:
Beetroot
Ginger
Potato
Radish
HTML Definition Lists
HTML and XHTML supports a list style which is called definition
lists where entries are listed like in a dictionary or encyclopedia. The
definition list is the ideal way to present a glossary, list of terms, or other
name/value list.
Definition List makes use of following three tags.
<dl> - Defines the start of the list
<dt> - A term
<dd> - Term definition
</dl> - Defines the end of the list
Example
<!DOCTYPE html>
<html>
<head>
<title>HTML Definition List</title>
</head>
<body>
<dl>
<dt><b>HTML</b></dt>
<dd>This stands for Hyper Text Markup Language</dd>
<dt><b>HTTP</b></dt>
<dd>This stands for Hyper Text Transfer Protocol</dd>
</dl>
</body>
</html>
This
will produce the following result:
HTML
This stands for Hyper Text Markup Language
HTTP
This stands for Hyper Text Transfer Protocol
HTML – TEXT LINKS
A webpage can contain various links that take you
directly to other pages and even specific parts of a given page. These links
are known as hyperlinks.
Hyperlinks allow visitors to navigate between Web
sites by clicking on words, phrases, and images. Thus you can create hyperlinks
using text or images available on a webpage.
Note: I recommend you to go through a short tutorial on Understanding
URL
Linking Documents
A link is specified using HTML tag <a>. This tag
is called anchor tag and anything between the opening <a> tag and
the closing </a> tag becomes part of the link and a user can click that
part to reach to the linked document. Following is the simple syntax to use
<a> tag.
<a href="Document URL" ...
attributes-list>Link Text</a>
Example
Let's try following example which links
http://www.tutorialspoint.com at your page:
<!DOCTYPE html>
<html>
<head>
<title>Hyperlink Example</title>
</head>
<body>
<p>Click following link</p>
<a href="http://www.tutorialspoint.com"
target="_self">This is sudhakar</a>
</body>
</html>
This will produce the following result.
where you can
click on the link generated to reach to the home page of Tutorials Point (in
this example).
Click following link
This is sudhakar
The target Attribute
We have used target attribute in our previous
example. This attribute is used to specify the location where linked document
is opened. Following are the possible options:
Option
|
Description
|
_blank
|
Opens the linked document in a new window or tab.
|
_self
|
Opens the linked document in the same frame.
|
_parent
|
Opens the linked document in the parent frame.
|
_top
|
Opens the linked document in the full body of the
window.
|
targetframe
|
Opens the linked document in a named targetframe.
|
Example
Try
following example to understand basic difference in few options given for
target attribute.
<!DOCTYPE
html>
<html>
<head>
<title>Hyperlink
Example</title>
<base
href="http://www.tutorialspoint.com/">
</head>
<body>
<p>Click
any of the following links</p>
<a
href="/html/index.htm" target="_blank">Opens in
New</a> |
<a
href="/html/index.htm" target="_self">Opens in
Self</a> |
<a
href="/html/index.htm" target="_parent">Opens in
Parent</a> |
<a
href="/html/index.htm" target="_top">Opens in Body</a>
</body>
</html>
This will produce the following
result.
where you can click on different links to
understand the difference between various options given for target attribute.
Click
any of the following links
Opens
in New | Opens in Self | Opens in Parent | Opens in Body
Use
of Base Path
When
you link HTML documents related to the same website, it is not required to give
a complete URL for every link. You can get rid of it if you use <base>
tag in your HTML document header. This tag is used to give a base path for all
the links. So your browser will concatenate given relative path to this base
path and will make a complete URL.
Example
Following example makes use of <base> tag to specify
base URL and later we can use relative path to all the links instead of giving
complete URL for every link.
<!DOCTYPE html>
<html>
<head>
<title>Hyperlink Example</title>
<base href="http://www.tutorialspoint.com/">
</head>
<body>
<p>Click following link</p>
<a href="/html/index.htm"
target="_blank">HTML Tutorial</a>
</body>
</html>
This will
produce the following result, where you can click on the link generated HTML Tutorial to
reach to the HTML tutorial.
Now given URL <a href="/html/index.htm" is being
considered as <ahref="http://www.tutorialspoint.com/html/index.htm"
Click following link
HTML Tutorial
Linking to a Page Section
You can create a link to a particular section of a given
webpage by using name attribute. This is a two-step process.
First create a link to the place where you want to reach
with-in a webpage and name it using <a...> tag as follows:
<h1>HTML Text Links <a
name="top"></a></h1>
Second step is to create a hyperlink to link the document and
place where you want to reach:
<a href="/html/html_text_links.htm#top">Go to
the Top</a>
This will produce following link, where you can click on
the link generated Go to the Top to reach to the top of the HTML Text
Link tutorial.
Setting
Link Colors
You
can set colors of your links, active links and visited links using link,
alink and vlink attributes of <body> tag.
Example
Save
the following in test.htm and open it in any web browser to see how link,
alink and vlink attributes work.
<!DOCTYPE
html>
<html>
<head>
<title>Hyperlink
Example</title>
<base
href="http://www.tutorialspoint.com/">
</head>
<body
alink="#54A250" link="#040404"
vlink="#F40633">
<p>Click
following link</p>
<a
href="/html/index.htm" target="_blank" >HTML
Tutorial</a>
</body>
</html>
This
will produce the following result. Just check color of the link before clicking
on it, next check its color when you activate it and when the link has been
visited.
Click
following link
HTML
Tutorial
Download
Links
You
can create text link to make your PDF, or DOC or ZIP files downloadable. This
is very simple; you just need to give complete URL of the downloadable file as
follows:
<!DOCTYPE
html>
<html>
<head>
<title>Hyperlink
Example</title>
</head>
<a
href="http://www.tutorialspoint.com/page.pdf">Download PDF
File</a>
</body>
</html>
This will produce following link and will be used to download
a file.
Download PDF File
File Download Dialog Box
Sometimes it is desired that you want to give an option where
a user will click a link and it will pop up a "File Download" box to
the user instead of displaying actual content. This is very easy and can be
achieved using an HTTP header in your HTTP response.
For example, if you want make a Filename file
downloadable from a given link then its syntax will be as follows.
#!/usr/bin/perl
# Additional HTTP Header
print "Content-Type:application/octet-stream;
name=\"FileName\"\r\n";
print "Content-Disposition: attachment;
filename=\"FileName\"\r\n\n";
# Open the target file and list down its content as follows
open( FILE, "<FileName" );
while(read(FILE, $buffer, 100)){
print("$buffer");
}
Note: For more detail on PERL CGI programs, go
through tutorial PERL and CGI.
HTML – IMAGE LINKS
We have seen how to create hypertext link using text
and we also learnt how to use images in our webpages. Now, we will learn how to
use images to create hyperlinks.
Example
It's simple to use an image as hyperlink. We just need
to use an image inside hyperlink at the place of text as shown below:
<!DOCTYPE html>
<html>
<head>
<title>Image Hyperlink Example</title>
</head>
<body>
<p>Click following link</p>
<a href="http://www.tutorialspoint.com"
target="_self">
<img src="/images/logo.png"
alt="Tutorials Point" border="0"/>
</a>
</body>
</html>
This will produce the following result, where you can click on the images to reach to the home page of
Tutorials Point.
Click following link
This was the simplest way of creating hyperlinks using
images. Next we will see how we can create Mouse-Sensitive Image Links.
Mouse-Sensitive Images
The HTML and XHTML standards provides a feature that
lets you embed many different links inside a single image. You can create
different links on the single image based on different coordinates available on
the image. Once different links are attached to different coordinates, we can
click different parts of the image to open target documents. Such
mouse-sensitive images are known as image maps.
There are two ways to create image maps:
Server-side image maps - This is enabled by the ismap attribute
of the <img> tag and requires access to a server and related image-map
processing applications.
Client-side image maps - This is created with the usemap
attribute of the <img> tag, along with corresponding <map> and
<area> tags.
Server-Side Image Maps
Here you simply put your image inside a hyper link and use ismap
attribute which makes it special image and when the user clicks some place
within the image, the browser passes the coordinates of the mouse pointer along
with the URL specified in the <a> tag to the web server. The server uses
the mouse-pointer coordinates to determine which document to deliver back to
the browser.
When ismap is used, the href attribute of the containing
<a> tag must contain the URL of a server application like a cgi or PHP
script etc. to process the incoming request based on the passed coordinates.
The coordinates of the mouse position are screen pixels counted
from the upper-left corner of the image, beginning with (0,0). The coordinates,
preceded by a question mark, are added to the end of the URL.
For example, if a user clicks 20 pixels over and 30 pixels down
from the upper-left corner of the following image:
Click following link
Which has been generated by the following code snippet:
<!DOCTYPE html>
<html>
<head>
<title>ISMAP Hyperlink Example</title>
</head>
<body>
<p>Click following link</p>
<a href="/cgi-bin/ismap.cgi"
target="_self">
<img ismap src="/images/logo.png" alt="Tutorials
Point" border="0"/>
</a>
</body>
</html>
Then the browser sends the following search parameters to the web
server which can be processed by ismap.cgi script or map file and
you can link whatever documents you like to these coordinates:
/cgi-bin/ismap.cgi?20,30
This way you can assign different links to different coordinates
of the image and when those coordinates are clicked, you can open corresponding
linked document. To learn more about ismap attribute, you can check How
to use Image ismap?
Note: You will learn CGI programming when
you will study Perl programming. You can write your script to process these
passed coordinates using PHP or any other script as well. For now, let's
concentrate on learning HTML and later you can revisit this section.
Client-Side Image Maps
Client side image maps are enabled by the usemap attribute
of the <img /> tag and defined by special <map> and <area>
extension tags.
The image that is going to form the map is inserted into the page
using the <img /> tag as a normal image, except it carries an extra
attribute called usemap. The value of the usemap attribute is the value
which will be used in a <map> tag to link map and image tags. The
<map> along with <area> tags define all the image coordinates and
corresponding links.
The <area> tag inside the map tag, specifies the shape and
the coordinates to define the boundaries of each clickable hotspot available on
the image. Here's an example from the image map:
<!DOCTYPE html>
<html>
<head>
<title>USEMAP Hyperlink Example</title>
</head>
<body>
<p>Search and click the hotspot</p>
<img src=/images/html.gif alt="HTML Map"
border="0" usemap="#html"/>
<!-- Create Mappings -->
<map name="html">
<area shape="circle"
coords="80,80,20" href="/css/index.htm"
alt="CSS Link" target="_self" />
<area shape="rect"
coords="5,5,40,40" alt="jQuery Link"
href="/jquery/index.htm" target="_self" />
</map>
</body>
</html>
Coordinate System
The actual value of coords is totally dependent on the shape in
question. Here is a summary, to be followed by detailed examples:
rect = x1 , y1 , x2 , y2
x1 and y1 are the coordinates of the upper left corner of the
rectangle; x2 and y2 are the coordinates of the lower right corner.
circle = xc , yc , radius
xc and yc are the coordinates of the center of the circle, and
radius is the circle's radius. A circle centered at 200,50 with a radius of 25
would have the attribute coords="200,50,25"
poly = x1 , y1 , x2 , y2 , x3 , y3 , ... xn
, yn
The various x-y pairs define vertices (points) of the polygon,
with a "line" being drawn from one point to the next point. A
diamond-shaped polygon with its top point at 20,20 and 40 pixels across at its
widest points would have the attribute coords="20,20,40,40,20,60,0,40".
All coordinates are relative to the upper-left corner of the image
(0,0). Each shape has a related URL. You can use any image software to know the
coordinates of different positions.
HTML – FRAMES
HTML frames are used to divide your browser window
into multiple sections where each section can load a separate HTML document. A
collection of frames in the browser window is known as a frameset. The window
is divided into frames in a similar way the tables are organized: into rows and
columns.
Disadvantages of Frames
There are few drawbacks with using frames, so it's
never recommended to use frames in your webpages:
Some smaller devices cannot cope with frames often
because their screen is not big enough to be divided up.
Sometimes your page will be displayed differently on
different computers due to different screen resolution.
The browser's back button might not work as
the user hopes.
There are still few browsers that do not support
frame technology.
Creating Frames
To use frames on a page we use <frameset> tag
instead of <body> tag. The <frameset> tag defines, how to divide
the window into frames. The rows attribute of <frameset> tag
defines horizontal frames and cols attribute defines vertical frames.
Each frame is indicated by <frame> tag and it defines which HTML document
shall open into the frame.
Example
Following is the example to create three horizontal
frames:
<!DOCTYPE html>
<html>
<head>
<title>HTML Frames</title>
</head>
<frameset rows="10%,80%,10%">
<frame name="top"
src="/html/top_frame.htm" />
<frame name="main"
src="/html/main_frame.htm" />
<frame name="bottom"
src="/html/bottom_frame.htm" />
<noframes>
<body>Your browser does not support
frames.
</body>
</noframes>
</frameset>
</html>
This
will produce the following result:
Example
Let's
put the above example as follows, here we replaced rows attribute by cols and
changed their width. This will create all the three frames vertically:
<!DOCTYPE
html>
<html>
<head>
<title>HTML
Frames</title>
</head>
<frameset
cols="25%,50%,25%">
<frame
name="left" src="/html/top_frame.htm" />
<frame
name="center" src="/html/main_frame.htm" />
<frame
name="right" src="/html/bottom_frame.htm" />
<noframes>
<body>
Your
browser does not support frames.
</body>
</noframes>
</frameset>
</html>
This will
produce the following result:
The
<frameset> Tag Attributes
Following
are important attributes of the <frameset> tag: Attribute
|
Description
|
cols
|
Specifies
how many columns are contained in the frameset and the size of each column.
You can specify the width of each column in one of the four ways:
Absolute
values in pixels. For example, to create three vertical frames, use cols="100,
500,100".
A
percentage of the browser window. For example, to create three vertical
frames, use cols="10%, 80%,10%".
Using
a wildcard symbol. For example, to create three vertical frames, use cols="10%,
*,10%". In this case wildcard takes remainder of the window.
As
relative widths of the browser window. For example, to create three vertical
frames, use cols="3*,2*,1*". This is an alternative to
percentages. You can use relative widths of the browser window. Here the
window is divided into sixths: the first column takes up half of the window,
the second takes one third, and the third takes one sixth.
|
rows
|
This
attribute works just like the cols attribute and takes the same values, but
it is used to specify the rows in the frameset. For example, to create two
horizontal frames, use rows="10%, 90%". You can specify the
height of each row in the same way as explained above for columns.
|
border
|
This
attribute specifies the width of the border of each frame in pixels. For
example, border="5". A value of zero means no border.
|
frameborder
|
This
attribute specifies whether a three-dimensional border should be displayed
between frames. This attribute takes value either 1 (yes) or 0 (no). For
example frameborder="0" specifies no border.
|
framespacing
|
This
attribute specifies the amount of space between frames in a frameset. This
can take any integer value. For example framespacing="10" means
there should be 10 pixels spacing between each frames.
|
The
<frame> Tag Attributes
Following
are the important attributes of <frame> tag: Attribute
|
Description
|
src
|
This
attribute is used to give the file name that should be loaded in the frame.
Its value can be any URL. For example, src="/html/top_frame.htm"
will load an HTML file available in html directory.
|
name
|
This
attribute allows you to give a name to a frame. It is used to indicate which
frame a document should be loaded into. This is especially important when you
want to create links in one frame that load pages into an another frame, in
which case the second frame needs a name to identify itself as the target of
the link.
|
frameborder
|
This
attribute specifies whether or not the borders of that frame are shown; it
overrides the value given in the frameborder attribute on the
<frameset> tag if one is given, and this can take values either 1 (yes)
or 0 (no).
|
marginwidth
|
This
attribute allows you to specify the width of the space between the left and
right of the frame's borders and the frame's content. The value is given in
pixels. For example marginwidth="10".
|
marginheight
|
This
attribute allows you to specify the height of the space between the top and
bottom of the frame's borders and its contents. The value is given in pixels.
For example marginheight="10".
|
noresize
|
By
default, you can resize any frame by clicking and dragging on the borders of
a frame. The noresize attribute prevents a user from being able to resize the
frame. For example noresize="noresize".
|
scrolling
|
This
attribute controls the appearance of the scrollbars that appear on the frame.
This takes values either "yes", "no" or "auto".
For example scrolling="no" means it should not have scroll bars.
|
longdesc
|
This
attribute allows you to provide a link to another page containing a long
description of the contents of the frame. For example
longdesc="framedescription.htm"
|
Browser
Support for Frames
If
a user is using any old browser or any browser, which does not support frames
then <noframes> element should be displayed to the user.
So
you must place a <body> element inside the <noframes> element
because the <frameset> element is supposed to replace the <body>
element, but if a browser does not understand <frameset> element then it
should understand what is inside the <body> element which is contained in
a <noframes> element.
You
can put some nice message for your user having old browsers. For example, Sorry!!
your browser does not support frames. as shown in the above example.
Frame's
name and target attributes
One
of the most popular uses of frames is to place navigation bars in one frame and
then load main pages into a separate frame.
Let's
see following example where a test.htm file has following code:
<!DOCTYPE
html>
<html>
<head>
<title>HTML
Target Frames</title>
</head>
<frameset
cols="200, *">
<frame
src="/html/menu.htm" name="menu_page" />
<frame
src="/html/main.htm" name="main_page" />
<noframes>
<body>
Your
browser does not support frames.
</body>
</noframes>
</frameset>
</html>
Here,
we have created two columns to fill with two frames. The first frame is 200
pixels wide and will contain the navigation menu bar implemented by menu.htm
file. The second column fills in remaining space and will contain the main
part of the page and it is implemented by main.htm file. For all the
three links available in menu bar, we have mentioned target frame as main_page,
so whenever you click any of the links in menu bar, available link will open in
main page.
Following is the content of menu.htm file
<!DOCTYPE html>
<html>
<body bgcolor="#4a7d49">
<a href="http://www.google.com"
target="main_page">Google</a>
<br /><br />
<a href="http://www.microsoft.com"
target="main_page">Microsoft</a>
<br /><br />
<a href="http://news.bbc.co.uk"
target="main_page">BBC News</a>
</body>
</html>
Following is the content of main.htm file:
<!DOCTYPE html>
<html>
<body bgcolor="#b5dcb3">
<h3>This is main page and content from any link will be
displayed here.</h3>
<p>So now click any link and see the result.</p>
</body>
</html>
When we load test.htm file, it produces following
result:
Now you can try to click links available in the left panel
and see the result. The targetattribute can also take one of the following
values:
Option
|
Description
|
_self
|
Loads the page into the current frame.
|
_blank
|
Loads a page into a new browser window.opening a new
window.
|
_parent
|
Loads the page into the parent window, which in the
case of a single frameset is the main browser window.
|
_top
|
Loads the page into the browser window, replacing
any current frames.
|
targetframe
|
Loads the page into a named targetframe.
|
HTML – IFRAMES
You can define an inline frame with HTML tag <iframe>.
The <iframe> tag is not somehow related to <frameset> tag, instead,
it can appear anywhere in your document. The <iframe> tag defines a
rectangular region within the document in which the browser can display a
separate document, including scrollbars and borders.
The src attribute is used to specify the URL of
the document that occupies the inline frame.
Example
Following is the example to show how to use the
<iframe>:
<!DOCTYPE html>
<html>
<head>
<title>HTML Iframes</title>
</head>
<body>
<p>Document content goes here...</p>
<iframe src="/html/menu.htm"
width="555" height="200">
Sorry your browser does not support inline frames.
</iframe>
<p>Document content also go here...</p>
</body>
</html>
This will produce the following result:
Document content goes here...
Document content can also go here...
The <Iframe> Tag
Attributes
Most of the attributes of the <iframe> tag,
including name, class, frameborder, id, longdesc, marginheight, marginwidth,
name, scrolling, style, and title behave exactly like the corresponding
attributes for the <frame> tag.
Attribute
|
Description
|
src
|
This attribute is used to give the file name that
should be loaded in the frame. Its value can be any URL. For example,
|
src="/html/top_frame.htm" will load an
HTML file available in html directory.
|
|
name
|
This attribute allows you to give a name to a frame.
It is used to indicate which frame a document should be loaded into. This is
especially important when you want to create links in one frame that load
pages into an another frame, in which case the second frame needs a name to
identify itself as the target of the link.
|
frameborder
|
This attribute specifies whether or not the borders
of that frame are shown; it overrides the value given in the frameborder
attribute on the <frameset> tag if one is given, and this can take
values either 1 (yes) or 0 (no).
|
marginwidth
|
This attribute allows you to specify the width of
the space between the left and right of the frame's borders and the frame's
content. The value is given in pixels. For example
marginwidth="10".
|
marginheight
|
This attribute allows you to specify the height of
the space between the top and bottom of the frame's borders and its contents.
The value is given in pixels. For example marginheight="10".
|
noresize
|
By default, you can resize any frame by clicking and
dragging on the borders of a frame. The noresize attribute prevents a user
from being able to resize the frame. For example
noresize="noresize".
|
scrolling
|
This attribute controls the appearance of the
scrollbars that appear on the frame. This takes values either
"yes", "no" or "auto". For example
scrolling="no" means it should not have scroll bars.
|
longdesc
|
This attribute allows you to provide a link to another
page containing a long description of the contents of the frame. For example
longdesc="framedescription.htm"
|
HTML – BLOCKS
All the HTML elements can be categorized into two
categories (a) Block Level Elements (b)Inline Elements.
Block Elements
Block elements appear on the screen as if they have a
line break before and after them. For example, the <p>, <h1>,
<h2>, <h3>, <h4>, <h5>, <h6>, <ul>,
<ol>, <dl>, <pre>, <hr />, <blockquote>, and
<address> elements are all block level elements. They all start on their
own new line, and anything that follows them appears on its own new line.
Inline Elements
Inline elements, on the other hand, can appear within
sentences and do not have to appear on a new line of their own. The <b>,
<i>, <u>, <em>, <strong>, <sup>, <sub>,
<big>, <small>, <li>, <ins>, <del>, <code>,
<cite>, <dfn>, <kbd>, and <var> elements are all inline
elements.
Grouping HTML Elements
There are two important tags which we use very
frequently to group various other HTML tags (i) <div> tag and (ii)
<span> tag
The <div> tag
This is the very important block level tag which plays
a big role in grouping various other HTML tags and applying CSS on group of
elements. Even now <div> tag can be used to create webpage layout where
we define different parts (Left, Right, Top etc.) of the page using <div>
tag. This tag does not provide any visual change on the block but this has more
meaning when it is used with CSS.
Example
Following is a simple example of <div> tag. We
will learn Cascading Style Sheet (CSS) in a separate chapter but we used it
here to show the usage of <div> tag:
<!DOCTYPE html>
<html>
<head>
<title>HTML div Tag</title>
</head>
<body>
<!-- First group of tags -->
<div style="color:red">
<h4>This is first group</h4>
<p>Following is a list of vegetables</p>
<ul>
<li>Beetroot</li>
<li>Ginger</li>
<li>Potato</li>
<li>Radish</li>
</ul>
</div>
<!-- Second group of tags -->
<div style="color:green">
<h4>This is second group</h4>
<p>Following is a list of fruits</p>
<ul>
<li>Apple</li>
<li>Banana</li>
<li>Mango</li>
<li>Strawberry</li>
</ul>
</div>
</body>
</html>
This
will produce the following result:
THIS IS FIRST GROUP
Following is a list of vegetables
Beetroot
Ginger
Potato
Radish
THIS IS SECOND GROUP
Following is a list of fruits
Apple
Banana
Mango
Strawberry
The <span> tag
The HTML <span> is an inline element and it can be used to
group inline-elements in an HTML document. This tag also does not provide any
visual change on the block but has more meaning when it is used with CSS.
The difference between the <span> tag and the <div>
tag is that the <span> tag is used with inline elements whereas the
<div> tag is used with block-level elements.
Example
Following is a simple example of <span> tag. We will learn
Cascading Style Sheet (CSS) in a separate chapter but we used it here to show
the usage of <span> tag:
<!DOCTYPE html>
<html>
<head>
<title>HTML span Tag</title>
</head>
<body>
<p>This is <span
style="color:red">red</span> and this is <span
style="color:green">green</span></p>
</body>
</html>
This
will produce the following result:
This is red, and this is green
HTML – BACKGROUNDS
By default, your webpage background is white in color.
You may not like it, but no worries. HTML provides you following two good ways
to decorate your webpage background.
Html Background with Colors
Html Background with Images
Now let's see both the approaches one by one using
appropriate examples.
Html Background with Colors
The bgcolor attribute is used to control the
background of an HTML element, specifically page body and table backgrounds.
Following is the syntax to use bgcolor attribute with any HTML tag.
<tagname bgcolor="color_value"...>
This color_value can be given in any of the following
formats:
<!-- Format 1 - Use color name -->
<table bgcolor="lime" >
<!-- Format 2 - Use hex value -->
<table bgcolor="#f1f1f1" >
<!-- Format 3 - Use color value in RGB terms -->
<table bgcolor="rgb(0,0,120)" >
Example
Here are the examples to set background of an HTML
tag:
<!DOCTYPE html>
<html>
<head>
<title>HTML Background Colors</title>
</head>
<body>
<!-- Format 1 - Use color name -->
<table bgcolor="yellow"
width="100%">
<tr><td>
This background is yellow
</td></tr>
</table>
<!-- Format 2 - Use hex value -->
<table bgcolor="#6666FF" width="100%">
<tr><td>
This background is sky blue
</td></tr>
</table>
<!-- Format 3 - Use color value in RGB terms -->
<table bgcolor="rgb(255,0,255)"
width="100%">
<tr><td>
This background is green
</td></tr>
</table>
</body>
</html>
This
will produce the following result:
This background is yellow
This background is sky blue
This background is green
Html
Background with Images
The
background attribute can also be used to control the background of an
HTML element, specifically page body and table backgrounds. You can specify an
image to set background of your HTML page or table. Following is the syntax to
use background attribute with any HTML tag.
Note:
The background
attribute is deprecated and it is recommended to use Style Sheet for
background setting.
<tagname
background="Image URL"...>
The
most frequently used image formats are JPEG, GIF and PNG images.
Example
Here are the examples to set background images of a table.
<!DOCTYPE html>
<html>
<head>
<title>HTML Background Images</title>
</head>
<body>
<!-- Set table background -->
<table background="/images/html.gif"
width="100%" height="100">
<tr><td>
This background is filled up with HTML image.
</td></tr>
</table>
</body>
</html>
This
will produce the following result: This background is filled up with HTML image.
|
Patterned
& Transparent Backgrounds
You
might have seen many pattern or transparent backgrounds on various websites.
This simply can be achieved by using patterned image or transparent image in
the background.
It
is suggested that while creating patterns or transparent GIF or PNG images, use
the smallest dimensions possible even as small as 1x1 to avoid slow loading.
Example
Here are the examples to set background pattern of a table:
<!DOCTYPE html>
<html>
<head>
<title>HTML Background Images</title>
</head>
<body>
<!-- Set a table background using pattern -->
<table background="/images/pattern1.gif"
width="100%" height="100">
<tr><td>
This background is filled up with a pattern image.
</td></tr>
</table>
<!-- Another example on table background using pattern
-->
<table background="/images/pattern2.gif"
width="100%" height="100">
<tr><td>
This background is filled up with a pattern image.
</td></tr>
</table>
</body>
</html>
This will produce the following result:
HTML – COLORS
Colors are very important to give a good look and feel
to your website. You can specify colors on page level using <body> tag or
you can set colors for individual tags using bgcolor attribute.
The <body> tag has following attributes which
can be used to set different colors:
bgcolor - sets a color for the background of
the page.
text - sets a color for the body text.
alink - sets a color for active links or
selected links.
link - sets a color for linked text.
vlink - sets a color for visited links -
that is, for linked text that you have already clicked on.
HTML Color Coding Methods
There are following three different methods to set
colors in your web page:
Color names - You can specify color names
directly like green, blue or red.
Hex codes - A six-digit code representing the
amount of red, green, and blue that makes up the color.
Color decimal or percentage values - This
value is specified using the rgb() property.
Now we will see these coloring schemes one by one.
HTML Colors - Color Names
You can specify direct a color name to set text or
background color. W3C has listed 16 basic color names that will validate with
an HTML validator but there are over 200 different color names supported by
major browsers.
Note: Check a complete list of HTML Color Name.
W3C Standard 16 Colors
Here is the list of W3C Standard 16 Colors names and it is
recommended to use them.
Black
|
Gray
|
Silver
|
White
|
Yellow
|
Lime
|
Aqua
|
Fuchsia
|
Red
|
Green
|
Blue
|
Purple
|
Maroon
|
Olive
|
Navy
|
Teal
|
Example
Here
are the examples to set background of an HTML tag by color name:
<!DOCTYPE
html>
<html>
<head>
<title>HTML
Colors by Name</title>
</head>
<body
text="blue" bgcolor="green">
<p>Use
different color names for for body and table and see the result.</p>
<table
bgcolor="black">
<tr>
<td>
<font
color="white">This text will appear white on black
background.</font>
</td>
</tr>
</table>
</body>
</html>
HTML
Colors - Hex Codes
A
hexadecimal is a 6 digit representation of a color. The first two digits(RR)
represent a red value, the next two are a green value(GG), and the last are the
blue value(BB).
A
hexadecimal value can be taken from any graphics software like Adobe Photoshop,
Paintshop Pro or MS Paint.
Each
hexadecimal code will be preceded by a pound or hash sign #. Following is a
list of few colors using hexadecimal notation.
Color
|
Color HEX
|
#000000
|
|
#FF0000
|
|
#00FF00
|
|
#0000FF
|
|
#FFFF00
|
|
#00FFFF
|
|
#FF00FF
|
|
#C0C0C0
|
|
#FFFFFF
|
Example
Here
are the examples to set background of an HTML tag by color code in hexadecimal:
<!DOCTYPE
html>
<html>
<head>
<title>HTML
Colors by Hex</title>
</head>
<body
text="#0000FF" bgcolor="#00FF00">
<p>Use
different color hexa for for body and table and see the result.</p>
<table
bgcolor="#000000">
<tr>
<td>
<font
color="#FFFFFF">This text will appear white on black
background.</font>
</td>
</tr>
</table>
</body>
</html>
HTML Colors - RGB Values
This color value is specified using the rgb( ) property.
This property takes three values, one each for red, green, and blue. The value
can be an integer between 0 and 255 or a percentage.
Note: All the browsers does not support rgb() property of color so
it is recommended not to use it.
Following is a list to show few colors using RGB values.
Color
|
Color
RGB
|
rgb(0,0,0)
|
|
rgb(255,0,0)
|
|
rgb(0,255,0)
|
|
rgb(0,0,255)
|
|
rgb(255,255,0)
|
|
rgb(0,255,255)
|
|
rgb(255,0,255)
|
|
rgb(192,192,192)
|
|
rgb(255,255,255)
|
Example
Here
are the examples to set background of an HTML tag by color code using rgb()
values:
<!DOCTYPE
html>
<html>
<head>
<title>HTML
Colors by RGB code</title>
</head>
<body
text="rgb(0,0,255)" bgcolor="rgb(0,255,0)">
<p>Use
different color code for for body and table and see the result.</p>
<table bgcolor="rgb(0,0,0)">
<tr>
<td>
<font color="rgb(255,255,255)">This text will
appear white on black background.</font>
</td>
</tr>
</table>
</body>
</html>
Browser Safe Colors
Here is the list of 216 colors which are supposed to be
safest and computer independent colors. These colors very from hexa code 000000
to FFFFFF and they will be supported by all the computers having 256 color
palette.
000000
|
000033
|
000066
|
000099
|
0000CC
|
0000FF
|
003300
|
003333
|
003366
|
003399
|
0033CC
|
0033FF
|
006600
|
006633
|
006666
|
006699
|
0066CC
|
0066FF
|
009900
|
009933
|
009966
|
009999
|
0099CC
|
0099FF
|
00CC00
|
00CC33
|
00CC66
|
00CC99
|
00CCCC
|
00CCFF
|
00FF00
|
00FF33
|
00FF66
|
00FF99
|
00FFCC
|
00FFFF
|
330000
|
330033
|
330066
|
330099
|
3300CC
|
3300FF
|
333300
|
333333
|
333366
|
333399
|
3333CC
|
3333FF
|
336600
|
336633
|
336666
|
336699
|
3366CC
|
3366FF
|
339900
|
339933
|
339966
|
339999
|
3399CC
|
3399FF
|
33CC00
|
33CC33
|
33CC66
|
33CC99
|
33CCCC
|
33CCFF
|
33FF00
|
33FF33
|
33FF66
|
33FF99
|
33FFCC
|
33FFFF
|
660000
|
660033
|
660066
|
660099
|
6600CC
|
6600FF
|
663300
|
663333
|
663366
|
663399
|
6633CC
|
6633FF
|
666600
|
666633
|
666666
|
666699
|
6666CC
|
6666FF
|
669900
|
669933
|
669966
|
669999
|
6699CC
|
6699FF
|
66CC00
|
66CC33
|
66CC66
|
66CC99
|
66CCCC
|
66CCFF
|
66FF00
|
66FF33
|
66FF66
|
66FF99
|
66FFCC
|
66FFFF
|
990000
|
990033
|
990066
|
990099
|
9900CC
|
9900FF
|
993300
|
993333
|
993366
|
993399
|
9933CC
|
9933FF
|
996600
|
996633
|
996666
|
996699
|
9966CC
|
9966FF
|
999900
|
999933
|
999966
|
999999
|
9999CC
|
9999FF
|
99CC00
|
99CC33
|
99CC66
|
99CC99
|
99CCCC
|
99CCFF
|
99FF00
|
99FF33
|
99FF66
|
99FF99
|
99FFCC
|
99FFFF
|
CC0000
|
CC0033
|
CC0066
|
CC0099
|
CC00CC
|
CC00FF
|
CC3300
|
CC3333
|
CC3366
|
CC3399
|
CC33CC
|
CC33FF
|
CC6600
|
CC6633
|
CC6666
|
CC6699
|
CC66CC
|
CC66FF
|
CC9900
|
CC9933
|
CC9966
|
CC9999
|
CC99CC
|
CC99FF
|
CCCC00
|
CCCC33
|
CCCC66
|
CCCC99
|
CCCCCC
|
CCCCFF
|
CCFF00
|
CCFF33
|
CCFF66
|
CCFF99
|
CCFFCC
|
CCFFFF
|
FF0000
|
FF0033
|
FF0066
|
FF0099
|
FF00CC
|
FF00FF
|
FF3300
|
FF3333
|
FF3366
|
FF3399
|
FF33CC
|
FF33FF
|
FF6600
|
FF6633
|
FF6666
|
FF6699
|
FF66CC
|
FF66FF
|
FF9900
|
FF9933
|
FF9966
|
FF9999
|
FF99CC
|
FF99FF
|
FFCC00
|
FFCC33
|
FFCC66
|
FFCC99
|
FFCCCC
|
FFCCFF
|
FFFF00
|
FFFF33
|
FFFF66
|
FFFF99
|
FFFFCC
|
FFFFFF
|
UNIT-3
HTML – FONTS
Fonts play a very important role in making a website more user
friendly and increasing content readability. Font face and color depends
entirely on the computer and browser that is being used to view your page but
you can use HTML <font> tag to add style, size, and color to the
text on your website. You can use a <basefont> tag to set all of
your text to the same size, face, and color.
The font tag is having three attributes called size, color,
and face to customize your fonts. To change any of the font attributes
at any time within your webpage, simply use the <font> tag. The text that
follows will remain changed until you close with the </font> tag. You can
change one or all of the font attributes within one <font> tag.
Note: The font and basefont tags are
deprecated and it is supposed to be removed in a future version of HTML. So
they should not be used rather, it's suggested to use CSS styles to manipulate
your fonts. But still for learning purpose, this chapter will explain font and
basefont tags in detail.
Set Font Size
You can set content font size using size attribute. The
range of accepted values is from 1(smallest) to 7(largest). The default size of
a font is 3.
Example
<!DOCTYPE html>
<html>
<head>
<title>Setting Font Size</title>
</head>
<body>
<font size="1">Font
size="1"</font><br />
<font size="2">Font
size="2"</font><br />
<font size="3">Font
size="3"</font><br />
<font size="4">Font
size="4"</font><br />
<font size="5">Font
size="5"</font><br />
<font size="6">Font size="6"</font><br
/>
<font size="7">Font
size="7"</font>
</body>
</html>
This will
produce the following result:
Font
size="1"
Font
size="2" Font size="3"
Font size="4"
Font
size="5" Font
size="6" Font size="7"
Relative
Font Size
You can
specify how many sizes larger or how many sizes smaller than the preset font
size should be. You can specify it like <font size="+n"> or
<font size="-n">
Example
<!DOCTYPE
html>
<html>
<head>
<title>Relative
Font Size</title>
</head>
<body>
<font
size="-1">Font size="-1"</font><br />
<font
size="+1">Font size="+1"</font><br />
<font
size="+2">Font size="+2"</font><br />
<font
size="+3">Font size="+3"</font><br />
<font
size="+4">Font size="+4"</font>
</body>
</html>
This will produce the following
result:
Font size="-1"
Font size="+1"
Font size="+2"
Font size="+3"
Font size="+4"
Setting
Font Face
You can
set font face using face attribute but be aware that if the user viewing
the page doesn't have the font installed, they will not be able to see it.
Instead user will see the default font face applicable to the user's computer.
Example
<!DOCTYPE
html>
<html>
<head>
<title>Font
Face</title>
</head>
<body>
<font
face="Times New Roman" size="5">Times New
Roman</font><br />
<font
face="Verdana" size="5">Verdana</font><br />
<font
face="Comic sans MS" size="5">Comic Sans
MS</font><br />
<font
face="WildWest" size="5">WildWest</font><br
/>
<font
face="Bedrock" size="5">Bedrock</font><br />
</body>
</html>
This will produce the following
result:
Times New
Roman Verdana Comic Sans MS WildWest Bedrock
Specify
alternate font faces
A visitor
will only be able to see your font if they have that font installed on their
computer. So, it is possible to specify two or more font face alternatives by
listing the font face names, separated by a comma.
<font
face="arial,helvetica">
<font
face="Lucida Calligraphy,Comic Sans MS,Lucida Console">
When your
page is loaded, their browser will display the first font face available. If
none of the given fonts are installed, then it will display the default font
face Times New Roman.
Note: Check a complete list of HTML
Standard Fonts.
Setting Font Color
You
can set any font color you like using color attribute. You can specify
the color that you want by either the color name or hexadecimal code for that
color.
Note: You can check a complete list of HTML Color Name with
Codes.
Example
<!DOCTYPE
html>
<html>
<head>
<title>Setting
Font Color</title>
</head>
<body>
<font
color="#FF00FF">This text is in pink</font><br />
<font
color="red">This text is red</font>
</body>
</html>
This will
produce the following result:
This
text is in pink This text is red
The <basefont> Element:
The
<basefont> element is supposed to set a default font size, color, and
typeface for any parts of the document that are not otherwise contained within
a <font> tag. You can use the <font> elements to override the
<basefont> settings.
The
<basefont> tag also takes color, size and face attributes and it will
support relative font setting by giving size a value of +1 for a size larger or
-2 for two sizes smaller.
Example
<!DOCTYPE
html>
<html>
<head>
<title>Setting
Basefont Color</title>
</head>
<body>
<basefont
face="arial, verdana, sans-serif" size="2"
color="#ff0000">
<p>This
is the page's default font.</p>
<h2>Example
of the <basefont> Element</h2>
<p><font
size="+2" color="darkgray">
This
is darkgray text with two sizes larger
</font></p>
<p><font
face="courier" size="-1" color="#000000">
It
is a courier font, a size smaller and black in color.
</font></p>
</body>
</html>
This will
produce the following result:
This
is the page's default font.
Example of the <basefont> Element
This
is darkgray text with two sizes larger
It
is a courier font, a size smaller and black in color.
HTML – FORMS
HTML Forms
are required, when you want to collect some data from the site visitor. For
example, during user registration you would like to collect information such as
name, email address, credit card, etc.
A form
will take input from the site visitor and then will post it to a back-end
application such as CGI, ASP Script or PHP script etc. The back-end application
will perform required processing on the passed data based on defined business
logic inside the application.
There are
various form elements available like text fields, textarea fields, drop-down
menus, radio buttons, checkboxes, etc.
The HTML <form>
tag is used to create an HTML form and it has following syntax:
<form
action="Script URL" method="GET|POST">
form
elements like input, textarea etc.
</form>
Form
Attributes
Apart from
common attributes, following is a list of the most frequently used form
attributes:
Attribute
|
Description
|
action
|
Backend script ready to process your passed data.
|
method
|
Method to be used to upload data. The most frequently used are
GET and POST methods.
|
target
|
Specify the target window or frame where the result of the
script will be displayed. It takes values like _blank, _self, _parent etc.
|
enctype
|
You can use the enctype attribute to specify how the browser
encodes the data before it sends it to the server. Possible values are:
application/x-www-form-urlencoded - This is the standard method
most forms use in simple scenarios.
mutlipart/form-data - This is used when you want to upload
binary data in the form of files like image, word file etc.
|
Note: You can refer to Perl &
CGI for a detail on how form data upload works.
HTML
Form Controls
There are
different types of form controls that you can use to collect data using HTML
form:
Text Input Controls
Checkboxes Controls
Radio Box Controls
Select Box Controls
File Select boxes
Hidden Controls
Clickable Buttons
Submit
and Reset Button
Text
Input Controls
There are
three types of text input used on forms:
Single-line
text input controls - This control is used for items that require only one
line of user input, such as search boxes or names. They are created using HTML <input>
tag.
Password
input controls - This is also a single-line text input but it masks the
character as soon as a user enters it. They are also created using HTMl
<input> tag.
Multi-line
text input controls - This is used when the user is required to give
details that may be longer than a single sentence. Multi-line input controls
are created using HTML <textarea> tag.
Single-line
text input controls
This
control is used for items that require only one line of user input, such as
search boxes or names. They are created using HTML <input> tag.
Example
Here is a
basic example of a single-line text input used to take first name and last
name:
<!DOCTYPE
html>
<html>
<head>
<title>Text
Input Control</title>
</head>
<body>
<form
>
First
name: <input type="text" name="first_name" />
<br>
Last
name: <input type="text" name="last_name" />
</form>
</body>
</html>
This will
produce the following result:
First name:
Last name:
Attributes
Following
is the list of attributes for <input> tag for creating text field.
Attribute
|
Description
|
type
|
Indicates the type of input control and for text input control
it will be set totext.
|
name
|
Used to give a name to the control which is sent to the server
to be recognized and get the value.
|
value
|
This can be used to provide an initial value inside the control.
|
size
|
Allows to specify the width of the text-input control in terms
of characters.
|
maxlength
|
Allows to specify the maximum number of characters a user can
enter into the text box.
|
Password
Input controls
This is
also a single-line text input but it masks the character as soon as a user
enters it. They are also created using HTML <input> tag but type
attribute is set to password.
Example
Here is a
basic example of a single-line password input used to take user password:
<!DOCTYPE
html>
<html>
<head>
<title>Password
Input Control</title>
</head>
<body>
<form
>
User
ID : <input type="text" name="user_id" />
<br>
Password:
<input type="password" name="password" />
</form>
</body>
</html>
This will
produce the following result:
User
ID :
Attributes
Following
is the list of attributes for <input> tag for creating password field.
type
|
Indicates the type of input control and for password input
control it will be set to password.
|
name
|
Used to give a name to the control which is sent to the server
to be recognized and get the value.
|
value
|
This can be used to provide an initial value inside the control.
|
size
|
Allows to specify the width of the text-input control in terms
of characters.
|
maxlength
|
Allows to specify the maximum number of characters a user can
enter into the text box.
|
Multiple-Line
Text Input Controls
This is
used when the user is required to give details that may be longer than a single
sentence. Multi-line input controls are created using HTML <textarea>
tag.
Example
Here
is a basic example of a multi-line text input used to take item description:
<!DOCTYPE
html>
<html>
<head>
<title>Multiple-Line
Input Control</title>
</head>
<body>
<form>
Description:
<br />
<textarea
rows="5" cols="50" name="description">
Enter
description here...
</textarea>
</form>
</body>
</html>
This will
produce the following result:
Description
:
Attributes
Following
is the list of attributes for <textarea> tag.
Attribute
|
Description
|
name
|
Used to give a name to the control which is sent to the server
to be recognized and get the value.
|
rows
|
Indicates the number of rows of text area box.
|
cols
|
Indicates the number of columns of text area box
|
Checkbox
Control
Checkboxes
are used when more than one option is required to be selected. They are also
created using HTML <input> tag but type attribute is set to checkbox.
Example
Here is an
example HTML code for a form with two checkboxes:
<!DOCTYPE
html>
<html>
<head>
<title>Checkbox
Control</title>
</head>
<body>
<form>
<input
type="checkbox" name="maths" value="on"> Maths
<input
type="checkbox" name="physics" value="on">
Physics
</form>
</body>
</html>
Attributes
Following
is the list of attributes for <checkbox> tag.
Attribute
|
Description
|
type
|
Indicates the type of input control and for checkbox input
control it will be set to checkbox.
|
name
|
Used to give a name to the control which is sent to the server
to be recognized and get the value.
|
value
|
The value that will be used if the checkbox is selected.
|
checked
|
Set to checked if you want to select it by default.
|
Radio
Button Control
Radio
buttons are used when out of many options, just one option is required to be
selected. They are also created using HTML <input> tag but type attribute
is set to radio.
Example
Here is
example HTML code for a form with two radio buttons:
<!DOCTYPE
html>
<html>
<head>
<title>Radio
Box Control</title>
</head>
<body>
<form>
<input
type="radio" name="subject" value="maths">
Maths
<input
type="radio" name="subject" value="physics">
Physics
</form>
</body>
</html>
This will produce the following
result:
Maths
Physics
Attributes
Following
is the list of attributes for radio button.
Attribute
|
Description
|
type
|
Indicates the type of input control and for checkbox input
control it will be set to radio.
|
name
|
Used to give a name to the control which is sent to the server
to be recognized and get the value.
|
value
|
The value that will be used if the radio box is selected.
|
checked
|
Set to checked if you want to select it by default.
|
Select
Box Control
A select
box, also called drop down box which provides option to list down various
options in the form of drop down list, from where a user can select one or more
options.
Example
Here is
example HTML code for a form with one drop down box
<!DOCTYPE
html>
<html>
<head>
<title>Select
Box Control</title>
</head>
<body>
<form>
<select
name="dropdown">
<option
value="Maths" selected>Maths</option>
<option
value="Physics">Physics</option>
</select>
</form>
</body>
</html>
Attributes
Following is
the list of important attributes of <select> tag:
Attribute
|
Description
|
name
|
Used to give a name to the control which is sent to the server
to be recognized and get the value.
|
size
|
This can be used to present a scrolling list box.
|
multiple
|
If set to "multiple" then allows a user to select
multiple items from the menu.
|
Following
is the list of important attributes of <option> tag:
Attribute
|
Description
|
value
|
The value that will be used if an option in the select box box
is selected.
|
selected
|
Specifies that this option should be the initially selected
value when the page loads.
|
label
|
An alternative way of labeling options
|
File
Upload Box
If you
want to allow a user to upload a file to your web site, you will need to use a
file upload box, also known as a file select box. This is also created using
the <input> element but type attribute is set to file.
Example
Here is
example HTML code for a form with one file upload box:
<!DOCTYPE html>
<html>
<head>
<title>File Upload Box</title>
</head>
<body>
<form>
<input type="file" name="fileupload"
accept="image/*" />
</form>
</body>
</html>
This will produce the following
result:
Attributes
Following
is the list of important attributes of file upload box:
Attribute
|
Description
|
name
|
Used to give a name to the control which is sent to the server
to be recognized and get the value.
|
accept
|
Specifies the types of files that the server accepts.
|
Button
Controls
There are
various ways in HTML to create clickable buttons. You can also create a
clickable button using <input> tag by setting its type attribute to button.
The type attribute can take the following values:
Type
|
Description
|
submit
|
This creates a button that automatically submits a form.
|
reset
|
This creates a button that automatically resets form controls to
their initial values.
|
button
|
This creates a button that is used to trigger a client-side
script when the user clicks that button.
|
image
|
This creates a clickable button but we can use an image as
background of the button.
|
Example
Here is
example HTML code for a form with three types of buttons:
<!DOCTYPE
html>
<html>
<head>
<title>File
Upload Box</title>
</head>
<body>
<form>
<input
type="submit" name="submit" value="Submit" />
<input
type="reset" name="reset" value="Reset" />
<input
type="button" name="ok" value="OK" />
<input
type="image" name="imagebutton"
src="/html/images/logo.png" />
</form>
</body>
</html>
Hidden
Form Controls
Hidden
form controls are used to hide data inside the page which later on can be
pushed to the server. This control hides inside the code and does not appear on
the actual page. For example, following hidden form is being used to keep
current page number. When a user will click next page then the value of hidden
control will be sent to the web server and there it will decide which page will
be displayed next based on the passed current page.
Example
Here is
example HTML code to show the usage of hidden control:
<!DOCTYPE
html>
<html>
<head>
<title>File
Upload Box</title>
</head>
<body>
<form>
<p>This
is page 10</p>
<input
type="hidden" name="pagename" value="10" />
<input
type="submit" name="submit" value="Submit" />
<input
type="reset" name="reset" value="Reset" />
</form>
</body>
</html>
HTML – MARQUEES
An HTML marquee is a scrolling piece of text displayed either
horizontally across or vertically down your webpage depending on the settings.
This is created by using HTML <marquees> tag.
Note: The HTML <marquee> tag
may not be supported by various browsers so it is not recommended to rely on
this tag, instead you can use JavaScript and CSS to create such effects.
Syntax
A simple syntax to use HTML <marquee> tag is as follows:
<marquee attribute_name="attribute_value"....more
attributes>
One or more lines or text message or image
</marquee>
The
<marquee> Tag Attributes
Following
is the list of important attributes which can be used with <marquee> tag.
Attribute
|
Description
|
width
|
This specifies the width of the marquee. This can be a value
like 10 or 20% etc.
|
height
|
This specifies the height of the marquee. This can be a value
like 10 or 20% etc.
|
direction
|
This specifies the direction in which marquee should scroll.
This can be a value like up, down, left or right.
|
behavior
|
This specifies the type of scrolling of the marquee. This can
have a value like scroll, slide and alternate.
|
scrolldelay
|
This specifies how long to delay between each jump. This will
have a value like 10 etc.
|
scrollamount
|
This specifies the speed of marquee text. This can have a value
like 10 etc.
|
loop
|
This specifies how many times to loop. The default value is
INFINITE, which means that the marquee loops endlessly.
|
bgcolor
|
This specifies background color in terms of color name or color
hex value.
|
hspace
|
This specifies horizontal space around the marquee. This can be
a value like 10 or 20% etc.
|
vspace
|
This specifies vertical space around the marquee. This can be a
value like 10 or 20% etc.
|
Below are few examples to demonstrate the usage of marquee tag.
Examples - 1
<!DOCTYPE html>
<html>
<head>
<title>HTML marquee Tag</title>
</head>
<body>
<marquee>This is basic example of marquee</marquee>
</body>
</html>
This will produce the following
result:
Examples
- 2
<!DOCTYPE
html>
<html>
<head>
<title>HTML
marquee Tag</title>
</head>
<body>
<marquee
width="50%">This example will take only 50% width</marquee>
</body>
</html>
This will
produce the following result:
Examples
- 3
<!DOCTYPE
html>
<html>
<head>
<title>HTML
marquee Tag</title>
</head>
<body>
<marquee
direction="right">This text will scroll from left to
right</marquee>
</body>
</html>
This will produce the following
result:
Examples
- 4
<!DOCTYPE
html>
<html>
<head>
<title>HTML
marquee Tag</title>
</head>
<body>
<marquee
direction="up">This text will scroll from bottom to
up</marquee>
</body>
</html>
This will produce the following
result:
HTML – HEADER
We have learnt that a typical HTML document will have following
structure:
Document declaration tag
<html>
<head>
Document header related tags
</head>
<body>
Document body related tags
</body>
</html>
This chapter will give a little more detail about header part
which is represented by HTML <head> tag. The <head> tag is a
container of various important tags like <title>, <meta>,
<link>, <base>, <style>, <script>, and <noscript>
tags.
The HTML <title> Tag
The HTML <title> tag is used for specifying the title of the
HTML document. Following is an example to give a title to an HTML document:
<!DOCTYPE html>
<html>
<head>
<title>HTML Title Tag Example</title>
</head>
<body>
<p>Hello, World!</p>
</body>
</html>
This will produce the following result:
Hello, World!
The
HTML <meta> Tag
The
HTML <meta> tag is used to provide metadata about the HTML document which
includes information about page expiry, page author, list of keywords, page
description etc.
Following
are few of the important usages of <meta> tag inside an HTML document:
<!DOCTYPE
html>
<html>
<head>
<title>HTML
Meta Tag Example</title>
<!--
Provide list of keywords -->
<meta
name="keywords" content="C, C++, Java, PHP, Perl,
Python">
<!--
Provide description of the page -->
<meta
name="description" content="Simply Easy Learning by Tutorials
Point">
<!--
Author information -->
<meta
name="author" content="Tutorials Point">
<!--
Page content type -->
<meta
http-equiv="content-type" content="text/html;
charset=UTF-8">
<!--
Page refreshing delay -->
<meta
http-equiv="refresh" content="30">
<!--
Page expiry -->
<meta
http-equiv="expires" content="Wed, 21 June 2006 14:25:27
GMT">
<!--
Tag to tell robots not to index the content of a page -->
<meta
name="robots" content="noindex, nofollow">
</head>
<body>
<p>Hello,
World!</p>
</body>
</html
This will produce the following
result:
Hello,
World!
The
HTML <base> Tag
The
HTML <base> tag is used for specifying the base URL for all relative URLs
in a page, which means all the other URLs will be concatenated into base URL
while locating for the given item.
For
example, all the given pages and images will be searched after prefixing the
given URLs with base URL http://www.tutorialspoint.com/ directory:
<!DOCTYPE
html>
<html>
<head>
<title>HTML
Base Tag Example</title>
<base
href="http://www.tutorialspoint.com/" />
</head>
<body>
<img
src="/images/logo.png" alt="Logo Image"/>
<a
href="/html/index.htm" title="HTML Tutorial"/>HTML
Tutorial</a>
</body>
</html>
This will produce the following
result:
But
if you change base URL to something else, for example, if base URL is
http://www.tutorialspoint.com/home then image and other given links will become
like http://www.tutorialspoint.com/home/images/logo.png and
http://www.tutorialspoint.com/home/html/index.htm
The
HTML <link> Tag
The
HTML <link> tag is used to specify relationships between the current
document and external resource. Following is an example to link an external
style sheet file available in css sub-directory within web root
<!DOCTYPE
html>
<html>
<head>
<title>HTML
link Tag Example</title>
<base
href="http://www.tutorialspoint.com/" />
<link
rel="stylesheet" type="text/css"
href="/css/style.css">
</head>
<body>
<p>Hello,
World!</p>
</body>
</html>
This will produce the following
result:
Hello,
World!
The
HTML <style> Tag
The
HTML <style> tag is used to specify style sheet for the current HTML
document. Following is an example to define few style sheet rules inside
<style> tag:
<!DOCTYPE
html>
<html>
<head>
<title>HTML
style Tag Example</title>
<base
href="http://www.tutorialspoint.com/" />
<style
type="text/css">
.myclass{
background-color:
#aaa;
padding:
10px;
}
</style>
</head>
<body>
<p
class="myclass">Hello, World!</p>
</body>
</html>
This will produce
the following result:
Hello,
World!
Note: To learn about how Cascading
Style Sheet works, kindly check a separate tutorial available at
http://www.tutorialspoint.com/css
The HTML <script> Tag
The HTML <script> tag is used to include either external
script file or to define internal script for the HTML document. Following is an
example where we are using JavaScript to define a simple JavaScript function:
<!DOCTYPE html>
<html>
<head>
<title>HTML script Tag Example</title>
<base href="http://www.tutorialspoint.com/" />
<script type="text/JavaScript">
function Hello(){
alert("Hello, World");
}
</script>
</head>
<body>
<input type="button" onclick="Hello();"
name="ok" value="OK" />
</body>
</html>
This will produce the following result, where you can try to click on
the given button:
Note: To learn about how JavaScript
works, kindly check a separate tutorial available at: http://www.tutorialspoint.com/JavaScript
UNIT-4
HTML – STYLE SHEET
Cascading Style Sheets (CSS) describe how documents are presented
on screens, in print, or perhaps how they are pronounced. W3C has actively
promoted the use of style sheets on the Web since the consortium was founded in
1994.
Cascading Style Sheets (CSS) provide easy and effective
alternatives to specify various attributes for the HTML tags. Using CSS, you
can specify a number of style properties for a given HTML element. Each
property has a name and a value, separated by a colon (:). Each property declaration
is separated by a semi-colon (;).
Example
First let's consider an example of HTML document which makes use
of <font> tag and associated attributes to specify text color and font
size:
<!DOCTYPE html>
<html>
<head>
<title>HTML CSS</title>
</head>
<body>
<p><font color="green"
size="5">Hello, World!</font></p>
</body>
</html>
We can re-write above example with the help of Style Sheet as
follows:
<!DOCTYPE html>
<html>
<head>
<title>HTML CSS</title>
</head>
<body>
<p style="color:green;font-size:24px;">Hello,
World!</p>
</body>
</html>
This will produce the following result:
Hello, World!
You
can use CSS in three ways in your HTML document:
External
Style Sheet: Define style sheet rules in a separate .css file and then
include that file in your HTML document using HTML <link> tag.
Internal
Style Sheet: Define style sheet rules in header section of the HTML
document using <style> tag.
Inline
Style Sheet: Define style sheet rules directly along-with the HTML elements
using style attribute.
Let's
see all the three cases one by one with the help of suitable examples.
External
Style Sheet
If
you need to use your style sheet to various pages, then its always recommended
to define a common style sheet in a separate file. A cascading style sheet file
will have extension as .css and it will be included in HTML files using
<link> tag.
Example
Consider
we define a style sheet file style.css which has following rules:
.red{
color:
red;
}
.thick{
font-size:20px;
}
.green{
color:green;
}
Here
we defined three CSS rules which will be applicable to three different classes
defined for the HTML tags. I suggest you should not bother about how these
rules are being defined because you will learn them while studying CSS. Now
let's make use of the above external CSS file in our following HTML document:
<!DOCTYPE
html>
<html>
<head>
<title>HTML
External CSS</title>
<link
rel="stylesheet" type="text/css"
href="/html/style.css">
</head>
<body>
<p
class="red">This is red</p>
<p
class="thick">This is thick</p>
<p
class="green">This is green</p>
<p
class="thick green">This is thick and green</p>
</body>
</html>
This will produce the following
result:
This
is red
This
is thick
This
is green
This
is thick and green
Internal
Style Sheet
If
you want to apply Style Sheet rules to a single document only, then you can
include those rules in header section of the HTML document using <style>
tag.
Rules
defined in internal style sheet overrides the rules defined in an external CSS
file.
Example
Let's
re-write above example once again, but here we will write style sheet rules in
the same HTML document using <style> tag:
<!DOCTYPE
html>
<html>
<head>
<title>HTML
Internal CSS</title>
<style
type="text/css">
.red{
color:
red;
}
.thick{
font-size:20px;
}
.green{
color:green;
}
</style>
</head>
<body>
<p
class="red">This is red</p>
<p
class="thick">This is thick</p>
<p
class="green">This is green</p>
<p
class="thick green">This is thick and green</p>
</body>
</html>
This will produce the following
result:
This
is red
This
is thick
This
is green
This
is thick and green
Inline
Style Sheet
You
can apply style sheet rules directly to any HTML element using style attribute
of the relevant tag. This should be done only when you are interested to make a
particular change in any HTML element only.
Rules
defined inline with the element overrides the rules defined in an external CSS
file as well as the rules defined in <style> element.
Example
Let's
re-write above example once again, but here we will write style sheet rules
along with the HTML elements using style attribute of those elements.
<!DOCTYPE
html>
<html>
<head>
<title>HTML
Inline CSS</title>
</head>
<body>
<p
style="color:red;">This is red</p>
<p
style="font-size:20px;">This is thick</p>
<p
style="color:green;">This is green</p>
<p
style="color:green;font-size:20px;">This is thick and
green</p>
</body>
</html>
This will produce the following
result:
This
is red
This
is thick
This
is green
This
is thick and green
HTML – LAYOUTS
A webpage layout is very important to give better look to your
website. It takes considerable time to design a website's layout with great
look and feel.
Now- a-days, all modern websites are using CSS and JavaScript
based framework to come up with responsive and dynamic websites but you can
create a good layout using simple HTML tables or division tags in combination
with other formatting tags. This chapter will give you few examples on how to
create a simple but working layout for your webpage using pure HTML and its
attributes.
HTML Layout - Using Tables
The simplest and most popular way of creating layouts is using
HTML <table> tag. These tables are arranged in columns and rows, so you
can utilize these rows and columns in whatever way you like.
Example
For example, the following HTML layout example is achieved using a
table with 3 rows and 2 columns but the header and footer column spans both
columns using the colspan attribute:
<!DOCTYPE html>
<html>
<head>
<title>HTML Layout using Tables</title>
</head>
<body>
<table width="100%" border="0">
<tr>
<td colspan="2" bgcolor="#b5dcb3">
<h1>This is Web Page Main title</h1>
</td>
</tr>
<tr valign="top">
<td bgcolor="#aaa" width="50">
<b>Main Menu</b><br />
HTML<br />
PHP<br />
PERL...
</td>
<td
bgcolor="#eee" width="100" height="200">
Technical
and Managerial Tutorials
</td>
</tr>
<tr>
<td
colspan="2" bgcolor="#b5dcb3">
<center>
Copyright
© 2007 Tutorialspoint.com
</center>
</td>
</tr>
</table>
</body>
</html>
This will produce
the following result:
This is Web Page Main title
|
|
Main Menu HTML PHP PERL...
|
Technical and Managerial Tutorials
|
Copyright © 2007 Tutorialspoint.com
|
Multiple
Columns Layout - Using Tables
You can
design your webpage to put your web content in multiple pages. You can keep
your content in middle column and you can use left column to use menu and right
column can be used to put advertisement or some other stuff. This layout will
be very similar to what we have at our website tutorialspoint.com.
Example
Here
is an example to create three column layout:
<!DOCTYPE
html>
<html>
<head>
<title>Three
Column HTML Layout</title>
</head>
<body>
<table
width="100%" border="0">
<tr
valign="top">
<td
bgcolor="#aaa" width="20%">
<b>Main
Menu</b><br />
HTML<br
/>
PHP<br
/>
PERL...
</td>
<td
bgcolor="#b5dcb3" height="200" width="60%">
Technical
and Managerial Tutorials
</td>
<td
bgcolor="#aaa" width="20%">
<b>Right
Menu</b><br />
HTML<br
/>
PHP<br
/>
PERL...
</td>
</tr>
<table>
</body>
</html>
This will
produce the following result:
Main Menu
HTML
PHP
PERL...
|
Technical and Managerial Tutorials
|
Right Menu HTML
PHP
PERL...
|
HTML
Layouts - Using DIV, SPAN
The
<div> element is a block level element used for grouping HTML elements.
While the <div> tag is a block-level element, the HTML <span>
element is used for grouping elements at an inline level.
Although
we can achieve pretty nice layouts with HTML tables, but tables weren't really
designed as a layout tool. Tables are more suited to presenting tabular data.
Note: This example makes use of
Cascading Style Sheet (CSS), so before understanding this example you need to
have a better understanding on how CSS works.
Example
Here we
will try to achieve same result using <div> tag along with CSS, whatever
you have achieved using <table> tag in previous example.
<!DOCTYPE
html>
<html>
<head>
<title>HTML
Layouts using DIV, SPAN</title>
</head>
<body>
<div
style="width:100%">
<div
style="background-color:#b5dcb3; width:100%">
<h1>This
is Web Page Main title</h1>
</div>
<div
style="background-color:#aaa;
height:200px;width:100px;float:left;">
<div><b>Main
Menu</b></div>
HTML<br
/>
PHP<br
/>
PERL...
</div>
<div style="background-color:#eee;
height:200px;width:350px;float:left;">
<p>Technical and Managerial Tutorials</p>
</div>
<div style="background-color:#aaa;
height:200px;width:100px;float:right;">
<div><b>Right Menu</b></div>
HTML<br />
PHP<br />
PERL...
</div>
<div style="background-color:#b5dcb3;clear:both">
<center>
Copyright © 2007 Tutorialspoint.com
</center>
</div>
</div>
</body>
</html>
No comments:
Post a Comment