XHTML5 - links
Mathiasbynens.be - The XML serialization of HTML5, aka 'XHTML5'.
Blog.whatwg.org - XHTML5 in a nutshell.
Xhtml5.nl - DOCTYPE-declaratie HTML & XHTML.
XHTML5 - Introduction
Zero tolerance
XHTML5 does not allow "bad" HTML, HTML5 does. In that context XHTML5 follows the 100% strict rules of XHTML1.1.
Disadvantage. The use of XHTML5 has one big disadvantage. Every failure made in the markup language leads to a parsing error.
Advantage. Parsing errors show you you have made a mistake. People who like to use clean code make a good choice with XHTML5. As an alternative to HTML5.
In XHTML5
Parsing error. <!doctype html>: lower case not allowed | <!DOCTYPE html>: upper case obligatory.
Not validated. <head>...</head> and <body>...</body> tags omitted.
Parsing error. <meta charset="utf-8"> not allowed | <meta charset="utf-8" /> obligatory.
Parsing error. <hr> not allowed | <hr /> obligatory.
Parsing error. </p> tag omitted | </p> tag obligatory.
Parsing error. ASCII HTML name not allowed | ASCII HTML number   obligatory.
Validated. ASCII HTML name & allowed | ASCII HTML number & allowed.
In HTML5
Validated. <!doctype html>: lower case allowed | <!DOCTYPE html>: upper case allowed.
Validated. <head>...</head> and <body>...</body> tags omitted.
Validated. <meta charset="utf-8">: allowed | <meta charset="utf-8" />: allowed.
Validated. <hr>: allowed | <hr />: allowed.
Validated. </p> tag omitted | omitted </p> tag optional.
Validated. ASCII HTML name allowed | ASCII HTML number   allowed.
Validated. ASCII HTML name & allowed | ASCII HTML number & allowed.
HTML5 - Example
HTML5 example:
<?php header("content-type: text/html;charset=utf-8"); ?>
<!DOCTYPE html>
<html lang="nl">
<head>
<meta charset="utf-8">
<title>HTML5</title>
</head>
<body>
[ content ]
</body>
</html>
XHTML5 - Example
XHTML5 example:
<?php header("content-type: application/xhtml+xml;charset=utf-8"); ?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" lang="nl">
<head>
<meta charset="utf-8" />
<title>XHTML5 = HTML5 in XML serialization mode</title>
</head>
<body>
[ content ]
</body>
</html>
XHTML5 - XML parsing errors
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