зеркало из https://github.com/mozilla/gecko-dev.git
88 строки
3.1 KiB
HTML
88 строки
3.1 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<!--
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https://bugzilla.mozilla.org/show_bug.cgi?id=1756118
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-->
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<head>
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<meta charset="utf-8">
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<title>Test for Bug 1756118: A removed ResizeObserver shouldn't keep the refresh driver ticking</title>
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<script 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 onload="run()">
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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1756118">Mozilla Bug 1756118</a>
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<div id="display">
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<div id="resizeMe"></div>
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</div>
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<pre id="test">
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<script>
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"use strict";
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SimpleTest.waitForExplicitFinish();
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SimpleTest.requestFlakyTimeout("need to allow time to pass so that we can " +
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"detect unwanted extra refresh driver ticks");
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const gUtils = SpecialPowers.getDOMWindowUtils(window);
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async function addAndRemoveResizeObserver(shouldResizeTarget) {
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// Register a resize observer:
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let ro = new ResizeObserver(function() { info("ResizeObserver callback"); });
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ro.observe(resizeMe);
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// double-rAF to flush pending paints:
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await new Promise(r => requestAnimationFrame(r));
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await new Promise(r => requestAnimationFrame(r));
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ok(gUtils.refreshDriverHasPendingTick,
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"Expecting refresh driver to be ticking, with ResizeObserver registered");
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// Unregister resize observer:
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ro.unobserve(resizeMe);
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// double-rAF to flush pending paints:
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await new Promise(r => requestAnimationFrame(r));
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await new Promise(r => requestAnimationFrame(r));
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// ...and importantly: make one additional change to the document.
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// This causes a refresh driver tick, which in buggy builds causes
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// the refresh driver to keep ticking indefinitely. (In buggy builds, this
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// bonus tick notifies our ResizeObserverController, and it never unregisters
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// and hence keeps the refresh driver ticking from that point on.)
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resizeMe.style.height = "100px";
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}
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async function expectTicksToStop() {
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let didStopTicking = false;
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// Note: The maximum loop count here is an arbitrary large value, just to let
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// us gracefully handle edge cases where multiple setTimeouts resolve before
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// a pending refresh driver tick. Really, we just want to be sure the refresh
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// driver *eventually* stops ticking, and we can do so gracefully by polling
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// with some generous-but-finite number of checks here.
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for (var i = 0; i < 100; i++) {
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await new Promise(r => setTimeout(r, 8));
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if(!gUtils.refreshDriverHasPendingTick) {
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didStopTicking = true;
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break;
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}
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}
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ok(didStopTicking, "refresh driver should have eventually stopped ticking");
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}
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async function run() {
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// By default, the refresh driver ticks on its own for some period of time
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// after pageload. Turn that off so we don't have to wait it out:
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await SpecialPowers.pushPrefEnv({'set':
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[['layout.keep_ticking_after_load_ms', 0]]});
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// Start out with a double-rAF, to flush paints from pageload:
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await new Promise(r => requestAnimationFrame(r));
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await new Promise(r => requestAnimationFrame(r));
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await addAndRemoveResizeObserver(true);
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await expectTicksToStop();
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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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