src/tools/perf/page_sets/tough_animation_cases/css_transitions_simultaneous_by_inserting_style_element.html

   1 <!DOCTYPE html>
   2 <meta name="viewport" content="width=device-width, user-scalable=no">
   3 <link rel="stylesheet" type="text/css" href="resources/tablet.css">
   4 <link rel="stylesheet" type="text/css" href="resources/transition.css">
   5 <script src="resources/perftesthelper.js"></script>
   6
   7 <container id="container"></container>
   8
   9 <script>
  10 var N = PerfTestHelper.getN(1000);
  11 var duration = 1000;
  12 var style = null;
  13 var keyframe = 1;
  14 var keyframeValues = [0, 1]
  15
  16 for (var i = 0; i < N; i++) {
  17   container.appendChild(document.createElement('target'));
  18 }
  19
  20 function startAllTransitions() {
  21   keyframe ^= 1;
  22   if (style) {
  23     style.remove();
  24   }
  25   style = document.createElement('style');
  26   style.textContent = 'target { opacity: ' + keyframeValues[keyframe] + '; }';
  27   container.appendChild(style);
  28 }
  29
  30 requestAnimationFrame(startAllTransitions);
  31 setInterval(startAllTransitions, duration);
  32
  33 PerfTestHelper.signalReady();
  34 </script>