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chromium/third_party/blink/web_tests/css2.1/t0509-c15-ids-00-a.html 

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
<html>
 <head>
  <title>CSS 2.1 Test Suite: ID as selector</title>
  <style type="text/css">
   body {color: red;}
   #test1 {color: green;}
   #test2 {color: green;}
   p#test3 {color: green;}
  </style>
  <link rel="help" href="http://www.w3.org/TR/CSS21/selector.html#id-selectors" title="5.9 ID selectors">
 </head>
 <body>
  <p id="test1"> This line should be green. </p>
  <p id="test2"> This line should be green. </p>
  <p id="test3"> This line should be green. </p>
 </body>
</html>