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      1 <!DOCTYPE html>
      2 <body>
      3 <style>
      4 textarea:valid {
      5     background-color: lime;
      6 }
      7 textarea:invalid {
      8     background-color: red;
      9 }
     10 </style>
     11 <script src="../resources/runner.js"></script>
     12 <textarea maxlength=2147483647 id="container"></textarea>
     13 <script>
     14 var container = document.getElementById('container');
     15 container.focus();
     16 PerfTestRunner.measureRunsPerSecond({run: function() {
     17     for (var i = 0; i < 500; ++i)
     18         document.execCommand('insertText', false, 'A quick brown fox jumps over the lazy dog.\n');
     19     container.value = '';
     20 }});
     21 </script>
     22 </body>
     23