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<!DOCTYPE html>
<meta charset=utf-8>
<title>Start time compatibility</title>
<link rel="help"
href="https://www.w3.org/TR/web-animations-1/#waiting-for-the-associated-effect">
<!-- Strictly speaking, this test is asserting timing behavior that is more
strict than required by spec. It tests that the start time of animations
created during a page rendering update match that update's timeline time.
This behavior is now consistent across browsers.
See https://bugs.webkit.org/show_bug.cgi?id=290993 -->
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<script src="/web-animations/resources/timing-override.js"></script>
<body>
<div id="log"></div>
<script>
'use strict';
promise_test(async t => {
await waitForCompositorReady();
const timeout_promise = () => {
return new Promise(resolve => setTimeout(resolve));
};
const expected_start_this_frame = () => {
return document.timeline.currentTime;
}
const expected_start_next_frame = () => {
return new Promise(resolve => {
requestAnimationFrame(() => {
resolve(document.timeline.currentTime);
})
});
}
const promises = [];
const make_animation = (description, expected_start_time) => {
const anim = createDiv(t).animate(null, 100 * MS_PER_SEC);
promises.push(
new Promise(resolve => {
Promise.all([anim.ready, expected_start_time]).then(responses => {
assert_times_equal(anim.startTime, responses[1], description);
resolve();
});
}));
}
// rAF align the start of the test.
await waitForAnimationFrames(2);
// Create an animation during the page rendering update.
// This animation should be aligned with the rAF time.
make_animation('during the first page rendering update',
expected_start_this_frame());
// Wait for a new JS call frame and start another animation. This animation
// should have its start time set to the timeline time of the next page
// rendering update.
await timeout_promise();
make_animation('after waiting for a new JS call frame',
expected_start_next_frame());
// Wait for another new JS call frame and start another animation. This
// animation, like the previous one, should have its start time set to
// the timeline time of the next page rendering update.
await timeout_promise();
make_animation('after waiting for a another JS call frame',
expected_start_next_frame());
// Now wait until the next page rendering update and ensure we are aligned
// with the rAF time.
await waitForAnimationFrames(1);
make_animation('during the second page rendering update',
expected_start_this_frame());
await Promise.all(promises);
}, `Checking the start time of animations started at various times between ` +
'two page rendering updates');
</script>
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