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chromium/third_party/blink/web_tests/fast/encoding/pseudo-xml.html 

<?xml version="1.0"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<body>
<p>Test for <a href="https://bugs.webkit.org/show_bug.cgi?id=9783">bug 9783</a>:
An XML declaration without an explicit encoding incorrectly triggers UTF-8 encoding in an HTML document</p>

<p id="result" />

<script>
if (window.testRunner)
    testRunner.dumpAsText();

document.getElementById("result").innerHTML = "Charset: " + 
    (document.charset ? document.charset : document.characterSet) + " (should be your browser default one)";
</script>

</body>
</html>