1<!DOCTYPE html> 2<body> 3<style> 4textarea:valid { 5 background-color: lime; 6} 7textarea:invalid { 8 background-color: red; 9} 10</style> 11<script src="../resources/runner.js"></script> 12<textarea maxlength=2147483647 id="container"></textarea> 13<script> 14var container = document.getElementById('container'); 15container.focus(); 16PerfTestRunner.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