Important rules regarding elements in XHTML 1.0:
Document must have one root element.<html>
<body>
<p>Only one "<html>" element allowed</p>
</body>
</html>
Elements must be properly nested.
BAD<p>This is not <b><i>good</b></i></p>
GOOD<p>This is <b><i>good</i></b></p>
Elements must be in lower case.
BAD<P>No <STRONG>upper case</STRONG> tags allowed</P>
GOOD<p><strong>Lower case</strong> only<p>
Elements must be properly closed.
BAD<table>
<tr>
<td>This is not a good table</tr>
</table>
GOOD<table>
<tr>
<td>This is a good table</td>
</tr>
</table>
Empty elements must be closed properly.
BAD<hr>
<br>
GOOD<hr />
<br />
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