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chromium/third_party/blink/web_tests/css2.1/t0509-id-sel-syntax-02-b.html 

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
<html>
 <head>
  <title>CSS 2.1 Test Suite: Escapes in ID selectors</title>
  <link rel="help" href="http://www.w3.org/TR/CSS21/selector.html#id-selectors">
  <style type="text/css">
    #div { color: red }
    #\0031 { color: green }
  </style>
 </head>
 <body>
   <div id="div"><p id="1">This text should be green</p></div>
 </body>
</html>