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chromium/third_party/blink/web_tests/fast/encoding/resources/undeclared-encoding.xhtml 

<?xml version="1.0"?>
<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <title>XHTML Document with no encoding declared</title>
  </head>
  <body>
    <p>Test default XHTML encoding (in the absence of an XML declaration).</p>
  </body>
</html>