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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link rel="help" src="https://drafts.csswg.org/scroll-animations-1/#named-timeline-range">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<script src="support/testcommon.js"></script>
<title>Animation range and delay</title>
</head>
<style type="text/css">
@keyframes anim {
cover 0% { /* resolves to -100% */
opacity: 0;
transform: none;
margin-left: 0px;
/* missing margin-right -- requires neutral keyframe at 0% */
}
cover 100% { /* resolves to 200% */
opacity: 1;
transform: translateX(300px);
margin-right: 0px;
/* missing margin-left -- requires neutral keyframe at 100% */
}
}
#scroller {
border: 10px solid lightgray;
overflow-y: scroll;
overflow-x: hidden;
width: 300px;
height: 200px;
}
#target {
margin: 800px 10px;
width: 100px;
height: 100px;
z-index: -1;
background-color: green;
animation: anim auto both linear;
animation-timeline: --t1;
animation-range-start: contain 0%;
animation-range-end: contain 100%;
view-timeline: --t1 block;
}
</style>
<body>
<div id=scroller>
<div id=target></div>
</div>
</body>
<script type="text/javascript">
async function runTest() {
function assert_progress_equals(anim, expected, errorMessage) {
assert_approx_equals(
anim.effect.getComputedTiming().progress,
expected, 1e-6, errorMessage);
}
function assert_opacity_equals(expected, errorMessage) {
assert_approx_equals(
parseFloat(getComputedStyle(target).opacity), expected, 1e-6,
errorMessage);
}
function assert_translate_x_equals(expected, errorMessage) {
const style = getComputedStyle(target).transform;
const regex = /matrix\(([^\)]*)\)/;
const captureGroupIndex = 1;
const translateIndex = 4;
const match = style.match(regex)[captureGroupIndex];
const translateX = parseFloat(match.split(',')[translateIndex].trim());
assert_approx_equals(translateX, expected, 1e-6, errorMessage);
}
function assert_property_equals(property, expected, errorMessage) {
const value = parseFloat(getComputedStyle(target)[property]);
assert_approx_equals(value, expected, 1e-6, errorMessage);
}
promise_test(async t => {
await waitForNextFrame();
const anims = document.getAnimations();
assert_equals(anims.length, 1,
"Should have one animation attatched to the view-timeline");
const anim = anims[0];
await anim.ready;
await waitForNextFrame();
// @ contain 0%
scroller.scrollTop = 700;
await waitForNextFrame();
assert_progress_equals(anim, 0, 'progress at contain 0%');
assert_translate_x_equals(100, 'translation at contain 0%');
assert_opacity_equals(1/3, 'opacity at contain 0%');
assert_property_equals('margin-left', 5, 'margin-left at contain 0%');
assert_property_equals('margin-right', 10, 'margin-right at contain 0%');
// @ contain 50%
scroller.scrollTop = 750;
await waitForNextFrame();
assert_progress_equals(anim, 0.5, 'progress at contain 50%');
assert_translate_x_equals(150, 'translation at contain 50%');
assert_opacity_equals(0.5, 'opacity at contain 50%');
assert_property_equals('margin-left', 7.5, 'margin-left at contain 50%');
assert_property_equals('margin-right', 7.5, 'margin-right at contain 50%');
// @ contain 100%
scroller.scrollTop = 800;
await waitForNextFrame();
assert_progress_equals(anim, 1, 'progress at contain 100%');
assert_translate_x_equals(200, 'translation at contain 100%');
assert_opacity_equals(2/3, 'opacity at contain 100%');
assert_property_equals('margin-left', 10, 'margin-left at contain 100%');
assert_property_equals('margin-right', 5, 'margin-right at contain 100%');
}, 'ViewTimeline with timeline offset keyframes outside [0,1]');
}
window.onload = runTest;
</script>
</html>
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