chromium/third_party/blink/web_tests/fast/css/case-sensitive-003.xhtml

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
 <head><meta charset="utf-8"/>
  <title>CSS Test: Case-sensitivity of pseudo-classes and pseudo-elements</title>
  <link rel="author" title="Elika J. Etemad" href="http://fantasai.inkedblade.net/"/>
  <link rel="help" href="http://www.w3.org/TR/CSS21/syndata.html#characters"/>
  <meta name="assert" content="Pseudo-class and pseudo-element names are ASCII
        case-insensitive."/>
  <style type="text/css">
    * { color: red; }
    *:before, *:after { color: red; }

    p:FiRSt-cHIlD {
      color: green;
    }

    :LinK, :viSiTed {
      color: green;
      text-decoration: none;
      font: inherit;
    }

    :lAnG(en) {
      color: green;
    }

    .flin {
      white-space: nowrap;
    }
    .flin:fIrsT-LinE {
      color: green;
    }

    .flet span {
      color: green;
    }
    .flet:fIRst-LEttEr {
      color: green;
    }

    .bef:before, .af:after {
      content: "This sentence must be green.";
    }
    .bef:BeFoRe, .af:aFtEr {
      color: green;
    }

    /* test for ASCII (not UNICODE) case-insensitivity */
    p:fİrst-child {
      color: red;
    }
    p:fırst-child {
      color: red;
    }
    :lin&#x212a; {
      color: red;
    }
  </style>

 </head>
 <body>
   <p>This sentence must be green.</p>
   <p><a href="">This sentence must be green.</a></p>
   <p><a href="unvisited:link">This sentence must be green.</a></p>
   <p lang="en">This sentence must be green.</p>
   <p class="flin">This sentence must be green.</p>
   <p class="flet">T<span>his sentence must be green.</span></p>
   <p class="bef"></p>
   <p class="af"></p>
 </body>
</html>