third_party/WebKit/LayoutTests/fast/dom/timer-throttling-hidden-page.html

   1 <html>
   2 <head>
   3     <script src="../../resources/js-test.js"></script>
   4     <script>
   5         description('<a href="https://bugs.webkit.org/show_bug.cgi?id=98474">Bug 98474</a>: Throttle DOM timers on hidden pages and <a href="http://crbug.com/400343">bug 400343</a> prerender pages.');
   6
   7         var jsTestIsAsync = true;
   8         var previousTime = 0;
   9         var timerCount = 0;
  10         var firstTimerWhileNotVisible = true;
  11         var isPageVisible = true;
  12         var timeoutInterval = 100;
  13         var tolerance = 20;
  14         var timerAlignmentInterval = 1000;
  15
  16         function testTimer()
  17         {
  18             var time = Date.now();
  19             if (!isPageVisible) {
  20                 if (firstTimerWhileNotVisible) {
  21                     firstTimerIntervalWhilePageNotVisible = time - previousTime;
  22                     var minValue = timeoutInterval - tolerance;
  23                     shouldBeGreaterThanOrEqual("firstTimerIntervalWhilePageNotVisible", minValue.toString());
  24                     var maxValue = timeoutInterval + timerAlignmentInterval + tolerance;
  25                     shouldBeTrue("firstTimerIntervalWhilePageNotVisible <= " + maxValue);
  26                     firstTimerWhileNotVisible = false;
  27                 } else {
  28                     timerIntervalWhilePageNotVisible = time - previousTime;
  29                     shouldBeCloseTo("timerIntervalWhilePageNotVisible", timerAlignmentInterval, tolerance);
  30                 }
  31             } else {
  32                 timerIntervalWhilePageVisible = time - previousTime;
  33                 shouldBeCloseTo("timerIntervalWhilePageVisible", timeoutInterval, tolerance);
  34             }
  35
  36             timerCount++;
  37             previousTime = time;
  38
  39             if (timerCount == 1) {
  40                 testRunner.setPageVisibility("hidden");
  41                 isPageVisible = false;
  42             } else if (timerCount == 3) {
  43                 testRunner.setPageVisibility("visible");
  44                 isPageVisible = true;
  45             } else if (timerCount == 5) {
  46                 testRunner.setPageVisibility("prerender");
  47                 isPageVisible = false;
  48                 firstTimerWhileNotVisible = true;
  49             } else if (timerCount == 7) {
  50                 testRunner.setPageVisibility("visible");
  51                 isPageVisible = true;
  52             } else if (timerCount >= 8){
  53                 finishJSTest();
  54                 return;
  55             }
  56             previousTime = Date.now();
  57             setTimeout(testTimer, timeoutInterval);
  58         }
  59
  60         function runTest()
  61         {
  62             if (!window.testRunner) {
  63                 debug('This test requires testRunner');
  64                 return;
  65             }
  66
  67             var timeoutIntervalSpans = document.getElementsByClassName('timeoutInterval');
  68             for (var i = 0; i < timeoutIntervalSpans.length; i++)
  69                 timeoutIntervalSpans[i].innerText = timeoutInterval;
  70
  71             document.getElementById('alignmentInterval').innerText = timerAlignmentInterval / 1000;
  72
  73             testRunner.dumpAsText();
  74             previousTime = Date.now();
  75             setTimeout(testTimer, timeoutInterval);
  76         }
  77     </script>
  78 </head>
  79 <body onload="runTest()">
  80     <p>
  81     This test measures the time taken to fire a <span class="timeoutInterval"></span>ms DOM Timer when the page visibility is set to "visible", "hidden", "visible", "prerender" and then back to "visible".  Due to page timer throttling, the timer should fire close to <span id="alignmentInterval"></span>s when page is hidden or prerender.  And it should fire close to <span class="timeoutInterval"></span>ms, when the page is visible.
  82     </p>
  83 </body>
  84 </html>