Here is a sample HTML5 with SVG content and it generates validation warnings.
I had to adjust URL's in this post, because I am blocked to use external URLs. I have replaced :// with -##
<!DOCTYPE html>
<html>
<head>
<title>SVG</title>
<meta charset="utf-8" />
</head>
<body>
<h2>HTML5 SVG Circle</h2>
<svg id="svgelem" height="200" xmlns="http-##www.w3.org/2000/svg">
<circle id="redcircle" cx="50" cy="50" r="50" fill="red" />
</svg>
</body>
</html>
Warnings: Undefined attribute name xmlns. Unknown tag g, polygon.
Compare it with XHTML, which does not generate validation errors:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http-##www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http-##www.w3.org/1999/xhtml"
xmlns:svg="http-##www.w3.org/2000/svg"
xmlns:xlink="http-##www.w3.org/1999/xlink">
<head>
<title>SVG embedded inline in XHTML</title>
</head>
<body>
<h1>SVG embedded inline in XHTML</h1>
<svg:svg version="1.1" baseProfile="full" width="300px" height="200px">
<svg:circle cx="150px" cy="100px" r="50px" fill="#ff0000" stroke="#000000" stroke-width="5px"/>
</svg:svg>
</body>
</html>
] 
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