LayoutTests/fast/frames/viewsource-xml.html - WebKit - Git at Google

 <!DOCTYPE html>

 <script>
 if (window.testRunner) {
     testRunner.dumpAsText();
     testRunner.dumpChildFramesAsText();
 }
 </script>

 <iframe viewsource src='data:text/html,<?xml version="1.0"?><div><section/></div>'></iframe>
	<!DOCTYPE html>

	<script>
	if (window.testRunner) {
	testRunner.dumpAsText();
	testRunner.dumpChildFramesAsText();
	}
	</script>

	<iframe viewsource src='data:text/html,<?xml version="1.0"?><div><section/></div>'></iframe>