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54 lines
2 KiB
HTML
54 lines
2 KiB
HTML
<!doctype html>
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<meta charset=utf-8>
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<title>Document timelines</title>
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<link rel="help" href="https://drafts.csswg.org/web-animations/#document-timelines">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="../../testcommon.js"></script>
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<div id="log"></div>
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<script>
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'use strict';
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function matchUnconditionalClamping(timestamp) {
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return parseFloat((Math.floor(timestamp / .02) * .02).toPrecision(8), 10);
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}
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async_test(t => {
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assert_greater_than_equal(document.timeline.currentTime, 0,
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'The current time is initially is positive or zero');
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// document.timeline.currentTime should be set even before document
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// load fires. We expect this code to be run before document load and hence
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// the above assertion is sufficient.
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// If the following assertion fails, this test needs to be redesigned.
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assert_true(document.readyState !== 'complete',
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'Test is running prior to document load');
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// Test that the document timeline's current time is measured from
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// navigationStart.
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//
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// We can't just compare document.timeline.currentTime to
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// window.performance.now() because currentTime is only updated on a sample
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// so we use requestAnimationFrame instead.
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window.requestAnimationFrame(rafTime => {
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t.step(() => {
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assert_equals(document.timeline.currentTime, matchUnconditionalClamping(rafTime),
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'The current time matches requestAnimationFrame time');
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});
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t.done();
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});
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}, 'Document timelines report current time relative to navigationStart');
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async_test(t => {
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window.requestAnimationFrame(rafTime => {
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t.step(() => {
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const iframe = document.createElement('iframe');
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document.body.appendChild(iframe);
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assert_greater_than_equal(iframe.contentDocument.timeline.currentTime, 0,
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'The current time of a new iframe is initially is positive or zero');
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});
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t.done();
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});
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}, 'Child frames do not report negative initial times');
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</script>
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