test_timeOrigin.html

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<!DOCTYPE HTML>

<html>

  <head>

    <title>Test for performance.timeOrigin</title>

    <meta http-equiv="content-type" content="text/html; charset=UTF-8">

    <script src="/tests/SimpleTest/SimpleTest.js"></script>

  </head>

  <body>

    <script type="text/js-worker" id="worker-src">

      postMessage({ now: performance.now(), timeOrigin: performance.timeOrigin });

    </script>

    <script type="text/js-worker" id="shared-worker-src">

      onconnect = function(evt) {

        evt.ports[0].postMessage({ now: performance.now(), timeOrigin: performance.timeOrigin });

};

    </script>

    <script class="testbody" type="text/javascript">

function testBasic() {

  ok("timeOrigin" in performance, "Performance.timeOrigin exists.");

  ok(performance.timeOrigin > 0, "TimeOrigin must be greater than 0.");

  next();

function testWorker() {

  var now = performance.now();

  var blob = new Blob([ document.getElementById("worker-src").textContent ],

                      { type: "text/javascript" });

  var w = new Worker(URL.createObjectURL(blob));

  w.onmessage = function(e) {

    ok (e.data.now + e.data.timeOrigin > now + performance.timeOrigin, "Comparing worker.now and window.now");

    next();

function testSharedWorker() {

  var now = performance.now();

  var blob = new Blob([ document.getElementById("shared-worker-src").textContent ],

                      { type: "text/javascript" });

  var w = new SharedWorker(URL.createObjectURL(blob));

  w.port.onmessage = function(e) {

    ok (e.data.now + e.data.timeOrigin > now + performance.timeOrigin, "Comparing worker.now and window.now");

    next();

var tests = [ testBasic, testWorker, testSharedWorker ];

function next() {

  if (!tests.length) {

    SpecialPowers.setBoolPref("privacy.reduceTimerPrecision", reduceTimePrecisionPrevPrefValue);

    SimpleTest.finish();

    return;

  var test = tests.shift();

  test();

SimpleTest.waitForExplicitFinish();

// It is a known issue that comparing time between a worker and a window

// when timer clamping is in effect may cause time to go backwards.

// Do not run this test with this preference set. For large values of

// clamping you will see failures. For small values, it is intermitant.

var reduceTimePrecisionPrevPrefValue = SpecialPowers.getBoolPref("privacy.reduceTimerPrecision");

SpecialPowers.setBoolPref("privacy.reduceTimerPrecision", false);

addLoadEvent(next);

      </script>

    </pre>

  </body>

</html>