Mainly in the code specification, the XHTML specification will be more stringent

XHTML elements must be nested correctly

  • Correct demonstration

    <b><i>This text is bold and italic</i></b>

  • Error model

    <b><i>This text is bold and italic</b></i>

The XHTML element must be closed

  • Correct demonstration

    <p>This is a paragraph</p>
<p>This is another paragraph</p>

A break: <br />
A horizontal rule: <hr />
An image: <img src="happy.gif" alt="Happy face" />

  • Error model

    <p>This is a paragraph
<p>This is another paragraph

A break: <br>
A horizontal rule: <hr>
An image: <img src="happy.gif" alt="Happy face">

Tag names must be in lowercase letters

  • Correct demonstration

    <body>
    <p>This is a paragraph</p>
</body>

  • Error model

    <BODY>
    <P>This is a paragraph</P>
</BODY>

An XHTML document must have a root element

  • All XHTML elements must be nested within the root element

    <html>
<head> ... </head>
<body> ... </body>
</html>

additional

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