36 lines
1.6 KiB
HTML
36 lines
1.6 KiB
HTML
<!doctype html>
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<html>
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<head>
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<link rel="help" href="https://html.spec.whatwg.org/multipage/webappapis.html#update-the-rendering">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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</head>
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<body>
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<script>
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/* Coarsen to 5 microseconds or coarser */
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const COARSE_RESOLUTION = 0.005;
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const CUSTOM_TIMELINE_DELTA = 0.002;
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const FLOATING_POINT_ERROR_EPSILON = 0.01;
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// Note that this test would fail if the platform introduces a jitter.
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// It is recommended that platforms that implement jitter run this test
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// with a flag that turns jitter off, if possible.
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const customTimeline = new DocumentTimeline({originTime: CUSTOM_TIMELINE_DELTA});
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promise_test(async t => {
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for (let i = 0; i < 32; ++i) {
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const timestamp = await new Promise(resolve => requestAnimationFrame(ts => resolve(ts)));
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const coarse_timestamp = Math.round(timestamp / COARSE_RESOLUTION) * COARSE_RESOLUTION;
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assert_approx_equals(timestamp, coarse_timestamp, FLOATING_POINT_ERROR_EPSILON,
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"timestamp should be coarsened");
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assert_approx_equals(timestamp, document.timeline.currentTime, FLOATING_POINT_ERROR_EPSILON,
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"document.timeline.currentTimeline should be the same as the rAF callback");
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assert_approx_equals(customTimeline.currentTime + CUSTOM_TIMELINE_DELTA,
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timestamp, FLOATING_POINT_ERROR_EPSILON,
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"originTime for custom timeline should not be coarsened");
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}
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});
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</script>
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</body>
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</html>
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