What Is XHTML?
- XHTML stands for EXtensible HyperText Markup Language
- XHTML is almost identical to HTML
- XHTML is stricter than HTML
- XHTML is HTML defined as an XML application
- XHTML is supported by all major browsers
Why XHTML?
Many pages on the internet contain
"bad" HTML.
This HTML code works fine in most
browsers (even if it does not follow the HTML rules):
<html>
<head>
<title>This is bad HTML</title>
<body>
<h1>Bad HTML
<p>This is a paragraph
</body>
<head>
<title>This is bad HTML</title>
<body>
<h1>Bad HTML
<p>This is a paragraph
</body>
Today's market consists of different
browser technologies. Some browsers run on computers, and some browsers run on
mobile phones or other small devices. Smaller devices often lack the resources
or power to interpret "bad" markup.
XML is a markup language where
documents must be marked up correctly (be "well-formed").
By combining the strengths of HTML and
XML, XHTML was developed.
XHTML is HTML redesigned as XML.
The Most Important Differences from
HTML:
Document Structure
- XHTML DOCTYPE is mandatory
- The xmlns attribute in <html> is mandatory
- <html>, <head>, <title>, and <body> are mandatory
XHTML Elements
- XHTML elements must be properly nested
- XHTML elements must always be closed
- XHTML elements must be in lowercase
- XHTML documents must have one root element
XHTML Attributes
- Attribute names must be in lower case
- Attribute values must be quoted
- Attribute minimization is forbidden
<!DOCTYPE ....> Is Mandatory
An XHTML document must have an XHTML
DOCTYPE declaration.
A complete list of all the XHTML
Doctypes is found in our HTML Tags Reference.
The <html>, <head>,
<title>, and <body> elements must also be present, and the xmlns
attribute in <html> must specify the xml namespace for the document.
This example shows an XHTML document
with a minimum of required tags:
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Title of document</title>
</head>
<body>
some content
</body>
</html>
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Title of document</title>
</head>
<body>
some content
</body>
</html>
XHTML Elements Must Be Properly Nested
In HTML, some elements can be
improperly nested within each other, like this:
<b><i>This text is bold and italic</b></i>
In XHTML, all elements must be properly
nested within each other, like this:
<b><i>This text is bold and italic</i></b>
XHTML Elements Must Always Be Closed
This is wrong:
<p>This is a paragraph
<p>This is another paragraph
<p>This is another paragraph
This is correct:
<p>This is a paragraph</p>
<p>This is another paragraph</p>
<p>This is another paragraph</p>
Empty Elements Must Also Be Closed
This is wrong:
A break: <br>
A horizontal rule: <hr>
An image: <img src="happy.gif" alt="Happy face">
A horizontal rule: <hr>
An image: <img src="happy.gif" alt="Happy face">
This is correct:
A break: <br />
A horizontal rule: <hr />
An image: <img src="happy.gif" alt="Happy face" />
A horizontal rule: <hr />
An image: <img src="happy.gif" alt="Happy face" />
XHTML Elements Must Be In Lower Case
This is wrong:
<BODY>
<P>This is a paragraph</P>
</BODY>
<P>This is a paragraph</P>
</BODY>
This is correct:
<body>
<p>This is a paragraph</p>
</body>
<p>This is a paragraph</p>
</body>
XHTML Attribute Names Must Be In Lower
Case
This is wrong:
<table WIDTH="100%">
This is correct:
<table width="100%">
Attribute Values Must Be Quoted
This is wrong:
<table width=100%>
This is correct:
<table width="100%">
Attribute Minimization Is Forbidden
Wrong:
<input type="checkbox" name="vehicle" value="car" checked />
Correct:
<input type="checkbox" name="vehicle" value="car" checked="checked" />
Wrong:
<input type="text" name="lastname" disabled />
Correct:
<input type="text" name="lastname" disabled="disabled" />
How to Convert from HTML to XHTML
- Add an XHTML <!DOCTYPE> to the first line of every page
- Add an xmlns attribute to the html element of every page
- Change all element names to lowercase
- Close all empty elements
- Change all attribute names to lowercase
- Quote all attribute values
