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

XHTML elements must be properly nested

  • Correct demonstration

    <b><i>This text is bold and italic</i></b>
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  • Error model

    <b><i>This text is bold and italic</b></i>
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XHTML elements 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" />
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  • 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">
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The label name must be lowercase

  • Correct demonstration

    <body>
    <p>This is a paragraph</p>
</body>
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  • Error model

    <BODY>
    <P>This is a paragraph</P>
</BODY>
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XHTML documents must have a root element

  • All XHTML elements must be nested within the root element

    <html>
<head> ... </head>
<body> ... </body>
</html>
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The content/inspiration of the article is taken from below

  • Continuous maintenance/update 500+ front end questions/notes github.com/noxussj/Int…

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