dom/performance/tests/test_timeOrigin.html

   1 <!DOCTYPE HTML>
   2 <html>
   3   <head>
   4     <title>Test for performance.timeOrigin</title>
   5     <meta http-equiv="content-type" content="text/html; charset=UTF-8">
   6     <script src="/tests/SimpleTest/SimpleTest.js"></script>
   7   </head>
   8   <body>
   9     <script type="text/js-worker" id="worker-src">
  10       postMessage({ now: performance.now(), timeOrigin: performance.timeOrigin });
  11     </script>
  12
  13     <script type="text/js-worker" id="shared-worker-src">
  14       onconnect = function(evt) {
  15         evt.ports[0].postMessage({ now: performance.now(), timeOrigin: performance.timeOrigin });
  16       };
  17     </script>
  18
  19     <script class="testbody" type="text/javascript">
  20
  21 function testBasic() {
  22   ok("timeOrigin" in performance, "Performance.timeOrigin exists.");
  23   ok(performance.timeOrigin > 0, "TimeOrigin must be greater than 0.");
  24   next();
  25 }
  26
  27 function testWorker() {
  28   var now = performance.now();
  29
  30   var blob = new Blob([ document.getElementById("worker-src").textContent ],
  31                       { type: "text/javascript" });
  32   var w = new Worker(URL.createObjectURL(blob));
  33   w.onmessage = function(e) {
  34     ok (e.data.now + e.data.timeOrigin > now + performance.timeOrigin, "Comparing worker.now and window.now");
  35     next();
  36   }
  37 }
  38
  39 function testSharedWorker() {
  40   var now = performance.now();
  41
  42   var blob = new Blob([ document.getElementById("shared-worker-src").textContent ],
  43                       { type: "text/javascript" });
  44   var w = new SharedWorker(URL.createObjectURL(blob));
  45   w.port.onmessage = function(e) {
  46     ok (e.data.now + e.data.timeOrigin > now + performance.timeOrigin, "Comparing worker.now and window.now");
  47     next();
  48   }
  49 }
  50
  51 var tests = [ testBasic, testWorker, testSharedWorker ];
  52 function next() {
  53   if (!tests.length) {
  54     SpecialPowers.setBoolPref("privacy.reduceTimerPrecision", reduceTimePrecisionPrevPrefValue);
  55     SimpleTest.finish();
  56     return;
  57   }
  58
  59   var test = tests.shift();
  60   test();
  61 }
  62
  63 SimpleTest.waitForExplicitFinish();
  64
  65 // It is a known issue that comparing time between a worker and a window
  66 // when timer clamping is in effect may cause time to go backwards.
  67 // Do not run this test with this preference set. For large values of
  68 // clamping you will see failures. For small values, it is intermitant.
  69 var reduceTimePrecisionPrevPrefValue = SpecialPowers.getBoolPref("privacy.reduceTimerPrecision");
  70 SpecialPowers.setBoolPref("privacy.reduceTimerPrecision", false);
  71
  72 addLoadEvent(next);
  73       </script>
  74     </pre>
  75   </body>
  76 </html>