72 lines
1.7 KiB
HTML
72 lines
1.7 KiB
HTML
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<!DOCTYPE html>
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<html class="reftest-wait">
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<meta charset="UTF-8">
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<title>sync start times</title>
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<link rel="match" href="sync-start-times-ref.html">
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<script src="/common/reftest-wait.js"></script>
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<style>
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#box-1, #box-2 {
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border: 1px solid white;
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height: 40px;
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left: 40px;
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position: absolute;
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top: 40px;
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width: 40px;
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/* To ensure Chrome to render the two boxes (one actively
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animating and the other not) with the same subpixel offset
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when there is subpixel translation during animation. */
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will-change: transform;
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}
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#box-1 {
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background: blue;
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z-index: 1;
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}
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#box-2 {
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background: white;
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z-index: 2;
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}
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#notes {
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position: absolute;
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left: 0px;
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top: 100px;
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}
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</style>
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<body>
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<div id="box-1"></div>
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<div id="box-2"></div>
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<p id="notes">
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This test creates a pair of animations, starts the first animation and then
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syncs the second animation to align with the first. The test passes if the
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box associated with the first animation is completely occluded by the
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second.
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</p>
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</body>
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<script>
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onload = function() {
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function createAnimation(elementId) {
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const elem = document.getElementById(elementId);
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const keyframes = [
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{ transform: 'translateX(0px)' },
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{ transform: 'translateX(200px)' }
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];
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const anim = elem.animate(keyframes, { duration: 1000 });
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anim.pause();
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return anim;
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};
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const anim1 = createAnimation('box-1');
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const anim2 = createAnimation('box-2');
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anim1.currentTime = 500;
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anim1.play();
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anim1.ready.then(() => {
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anim2.startTime = anim1.startTime;
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requestAnimationFrame(() => {
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takeScreenshot();
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});
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});
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};
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</script>
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