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Previously, we waited for the load event and used that event timestamp. But as far as I can tell the intent of this test is not to test the load event specifically, but just event timestamps. In opt builds, the reduceTimerPrecision pref was not being populated fast enough to take effect during the load process, and was causing (a lot of) intermittent failures. We refactor the test to use PushPrefEnv and test a different event. MozReview-Commit-ID: ILJYHRhUHnM --HG-- extra : rebase_source : 659ebbe2442647d1166725637bcd716ad94b9980
118 lines
4.0 KiB
HTML
Executable File
118 lines
4.0 KiB
HTML
Executable File
<!doctype html>
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<html>
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<!--
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https://bugzilla.mozilla.org/show_bug.cgi?id=77992
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-->
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<head>
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<meta charset="utf-8">
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<title>Test for Event.timeStamp (Bug 77992)</title>
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<script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
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<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
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</head>
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<body>
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<a target="_blank"
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href="https://bugzilla.mozilla.org/show_bug.cgi?id=77992">Mozilla Bug 77992</a>
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<p id="display"></p>
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<pre id="test">
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<script type="text/js-worker" id="worker-src">
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// Simply returns the event timestamp
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onmessage = function(evt) {
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postMessage(evt.timeStamp + performance.timeOrigin);
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}
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</script>
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<script type="text/js-worker" id="shared-worker-src">
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// Simply returns the event timestamp
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onconnect = function(evt) {
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var port = evt.ports[0];
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port.onmessage = function(messageEvt) {
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port.postMessage(messageEvt.timeStamp + performance.timeOrigin);
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};
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};
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</script>
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<script type="application/javascript">
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"use strict";
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SimpleTest.waitForExplicitFinish();
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SimpleTest.requestFlakyTimeout("untriaged");
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// This file performs tests that normalize the timeOrigin within a worker
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// and compare it to the page. When this occurs, time can appear to go backwards.
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// This is a known (and accepted) regression of privacy.reduceTimerPrecision so
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// we need to turn it off.
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SpecialPowers.pushPrefEnv({ "set": [
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["privacy.reduceTimerPrecision", false],
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["dom.event.highrestimestamp.enabled", true]
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]}, testRegularEvents);
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// Event.timeStamp should be relative to the time origin which is:
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//
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// Non-worker context: navigation start
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// Dedicated worker: navigation start of the document that created the worker
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// Shared worker: creation time of the shared worker
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//
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// See: https://w3c.github.io/web-performance/specs/HighResolutionTime2/Overview.html#sec-time-origin
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function testRegularEvents() {
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var timeBeforeEvent = performance.now();
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document.getElementById('test').addEventListener("click", function(evt) {
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var timeAfterEvent = performance.now();
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ok(evt.timeStamp >= timeBeforeEvent &&
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evt.timeStamp <= timeAfterEvent,
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"Event timestamp (" + evt.timeStamp + ") is in expected range: [" +
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timeBeforeEvent + ", " + timeAfterEvent + "]");
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testWorkerEvents();
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});
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document.getElementById('test').click();
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}
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function testWorkerEvents() {
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var blob = new Blob([ document.getElementById("worker-src").textContent ],
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{ type: "text/javascript" });
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var worker = new Worker(URL.createObjectURL(blob));
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worker.onmessage = function(evt) {
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var timeAfterEvent = performance.now() + performance.timeOrigin;
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ok(evt.data >= timeBeforeEvent &&
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evt.data <= timeAfterEvent,
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"Event timestamp in dedicated worker (" + evt.data +
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") is in expected range: [" +
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timeBeforeEvent + ", " + timeAfterEvent + "]");
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worker.terminate();
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testSharedWorkerEvents();
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};
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var timeBeforeEvent = performance.now() + performance.timeOrigin;
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worker.postMessage("");
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}
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function testSharedWorkerEvents() {
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var blob =
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new Blob([ document.getElementById("shared-worker-src").textContent ],
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{ type: "text/javascript" });
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// Delay creation of worker slightly so it is easier to distinguish
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// shared worker creation time from this document's navigation start
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setTimeout(function() {
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var timeBeforeEvent = performance.now() + performance.timeOrigin;
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var worker = new SharedWorker(URL.createObjectURL(blob));
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worker.port.onmessage = function(evt) {
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var timeAfterEvent = performance.now() + performance.timeOrigin;
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ok(evt.data >= timeBeforeEvent &&
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evt.data <= timeAfterEvent,
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"Event timestamp in shared worker (" + evt.data +
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") is in expected range: [" +
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timeBeforeEvent + ", " + timeAfterEvent + "]");
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worker.port.close();
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finishTests();
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};
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worker.port.start();
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worker.port.postMessage("");
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}, 500);
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}
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var finishTests = function() {
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SimpleTest.finish();
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};
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</script>
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</pre>
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</body>
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</html>
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