Html 5 has many features over HTML4 and its older version. In HTML 5 we can easily define the the detailed parsing rules (including "error handling") for this syntax which are largely compatible with popular implementations. All user agents should use these rules for resources that have the text/html media type.
For example take a look on the syntax.
Syntax for HTML
Quote:
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Example document</title>
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Syntax for HTML5 where document that conforms to the XML syntax of HTML5
Quote:
<?xml version="1.0" encoding="UTF-8"?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Example document</title>
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HTML5 eMag