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chromium/third_party/blink/web_tests/fast/encoding/yentest.html 

<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=shift-jis">
<script src="resources/yentestexternal.js" type="text/javascript"></script>
</HEAD>
<BODY>
<script>
if (window.testRunner)
    testRunner.dumpAsText();

writeYenExternal();
document.write("two backslashes inline: " + "\\" + "<br>");
</script>
</body>
</html>