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… use HTML5 without error messages?

ProfLogic
The file 
<!DOCTYPE html>
<html>
<head>
	<title>HTML5 and MathML</title>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
</head>
<body>
	<p>
		HTML5 and MathML:
		<math>
			<mrow>
				<mi>a</mi>
				<mo>=</mo>
				<mn>1</mn>
			</mrow>
		</math>.
	</p>
</body>
</html>
validates correctly using http://validator.w3.org/: “This document was successfully checked as HTML5!”.

However, Prince outputs the following errors:
$ prince html5-math.html html5-math.pdf
prince: html5-math.html:10: error: Tag math invalid
prince: html5-math.html:11: error: Tag mrow invalid
prince: html5-math.html:12: error: Tag mi invalid
prince: html5-math.html:13: error: Tag mo invalid
prince: html5-math.html:14: error: Tag mn invalid
mikeday
The error messages can't be avoided at present as we are not using a HTML5 parser, but the MathML should still work. Another option is using XHTML, or using the XML parser with -i xml.