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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link rel="help" src="https://www.w3.org/TR/scroll-animations-1/#named-range-animation-declaration">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<script src="/web-animations/resources/keyframe-utils.js"></script>
<script src="support/testcommon.js"></script>
<script src="/scroll-animations/scroll-timelines/testcommon.js"></script>
<title>Programmatic API overrides animation-range-*</title>
</head>
<style type="text/css">
#scroller {
border: 10px solid lightgray;
overflow-y: scroll;
overflow-x: hidden;
width: 300px;
height: 200px;
}
@keyframes anim {
from { margin-left: 0px; }
to { margin-left: 100px; }
}
#target {
margin: 800px 0px;
width: 100px;
height: 100px;
z-index: -1;
background-color: green;
}
.animate {
animation: anim auto linear;
view-timeline: --timeline;
animation-timeline: --timeline;
animation-range-start: entry 0%;
animation-range-end: entry 100%;
}
</style>
<body>
<div id=scroller>
<div id=target></div>
</div>
</body>
<script type="text/javascript">
async function runTest() {
function startAnimation(t) {
target.classList.add('animate');
t.add_cleanup(async () => {
target.classList.remove('animate');
await waitForNextFrame();
});
return target.getAnimations()[0];
}
promise_test(async t => {
// Points of interest:
// entry 0% @ 600
// entry 100% / contain 0% @ 700
// exit 0% / contain 100% @ 800
// exit 100% @ 900
const anim = startAnimation(t);
await anim.ready;
scroller.scrollTop = 650;
await waitForNextFrame();
// Timline time = (scroll pos - cover 0%) / (cover 100% - cover 0%) * 100%
// = (650 - 600)/(900 - 600) * 100% = 100/6%
assert_percents_equal(anim.timeline.currentTime, 100/6,
'timeline\'s current time before style change');
assert_percents_equal(anim.startTime, 0,
'animation\'s start time before style change');
// Range start of entry 0% aligns with timeline start. Thus, animation's
// and timeline's current time are equal.
assert_percents_equal(anim.currentTime, 100/6,
'animation\'s current time before style change');
// Iteration duration =
// (range end - range start) / (cover 100% - cover 0%) * 100%
// = (700 - 600) / (900 - 600) = 33.3333%
assert_percents_equal(anim.effect.getComputedTiming().duration,
100/3,
'iteration duration before first style change');
assert_equals(getComputedStyle(target).marginLeft, '50px',
'margin-left before style change');
// Step 1: Set the range end programmatically and range start via CSS.
// The start time will be respected since not previously set via the
// animation API.
await runAndWaitForFrameUpdate(() => {
anim.rangeEnd = 'contain 100%';
target.style.animationRangeStart = 'entry 50%';
});
// Animation range does not affect timeline's currentTime.
assert_percents_equal(
anim.timeline.currentTime, 100/6,
'timeline\'s current time after first set of range updates');
assert_percents_equal(
anim.startTime, 100/6,
'animation\'s start time after first set of range updates');
// Scroll position aligns with range start.
assert_percents_equal(
anim.currentTime, 0,
'animation\'s current time after first set of range updates');
// Iteration duration =
// (range end - range start) / (cover 100% - cover 0%) * 100%
// = (800 - 650) / (900 - 600) = 50%
assert_percents_equal(
anim.effect.getComputedTiming().duration, 50,
'iteration duration after first style change');
assert_equals(getComputedStyle(target).marginLeft, '0px',
'margin-left after first set of range updates');
// Step 2: Programmatically set the range start.
// Scroll position is current at entry 50%, thus the animation's current
// time is negative.
await runAndWaitForFrameUpdate(() => {
anim.rangeStart = 'contain 0%';
});
// animation current time =
// (scroll pos - range start) / (cover 100% - cover 0%) * 100%
// = (650 - 700) / (900 - 600) * 100% = -100/6%
assert_percents_equal(
anim.currentTime, -100/6,
'animation\'s current time after second set of range updates');
// Iteration duration =
// (range end - range start) / (cover 100% - cover 0%) * 100%
// = (800 - 700) / (900 - 600) = 33.3333%
assert_percents_equal(
anim.effect.getComputedTiming().duration, 100/3,
'iteration duration after second style change');
assert_equals(getComputedStyle(target).marginLeft, '0px',
'margin-left after second set of range updates');
// Jump to contain / cover 50%
scroller.scrollTop = 750;
await waitForNextFrame();
// animation current time =
// (scroll pos - range start) / (cover 100% - cover 0%) * 100%
// = (750 - 700) / (900 - 600) * 100% = 100/6%
assert_percents_equal(
anim.currentTime, 100/6,
'animation\'s current time after bumping scroll position');
assert_equals(getComputedStyle(target).marginLeft, '50px');
// Step 3: Try to update the range start via CSS. This change must be
// ignored since previously set programmatically.
await runAndWaitForFrameUpdate(() => {
target.style.animationRangeStart = "entry 50%";
});
assert_percents_equal(
anim.currentTime, 100/6,
'Current time unchanged after change to ignored CSS property');
assert_equals(
getComputedStyle(target).marginLeft, '50px',
'Margin-left unaffected by change to ignored CSS property');
}, 'Animation API call rangeStart overrides animation-range-start');
promise_test(async t => {
const anim = startAnimation(t);
await anim.ready;
scroller.scrollTop = 650;
await waitForNextFrame();
// Step 1: Set the range start programmatically and range end via CSS.
// The start time will be respected since not previously set via the
// animation API.
await runAndWaitForFrameUpdate(() => {
anim.rangeStart = "entry 50%";
target.style.animationRangeEnd = "contain 100%";
});
assert_percents_equal(
anim.timeline.currentTime, 100/6,
'timeline\'s current time after first set of range updates');
assert_percents_equal(
anim.startTime, 100/6,
'animation\'s start time after first set of range updates');
assert_percents_equal(
anim.currentTime, 0,
'animation\'s current time after first set of range updates');
assert_percents_equal(
anim.effect.getComputedTiming().duration, 50,
'iteration duration after first style change');
assert_equals(getComputedStyle(target).marginLeft, "0px",
'margin-left after first set of range updates');
// Step 2: Programmatically set the range.
// Scroll position is current at entry 50%, thus the animation's current
// time is negative.
await runAndWaitForFrameUpdate(() => {
anim.rangeStart = "contain 0%";
anim.rangeEnd = "contain 100%";
});
assert_percents_equal(
anim.currentTime, -100/6,
'animation\'s current time after second set of range updates');
assert_percents_equal(
anim.effect.getComputedTiming().duration, 100/3,
'iteration duration after second style change');
assert_equals(getComputedStyle(target).marginLeft, "0px",
'margin-left after second set of range updates');
// Jump to contain / cover 50%
scroller.scrollTop = 750;
await waitForNextFrame();
assert_percents_equal(
anim.currentTime, 100/6,
'animation\'s current time after bumping scroll position');
assert_equals(getComputedStyle(target).marginLeft, "50px");
// Step 3: Try to update the range end via CSS. This change must be
// ignored since previously set programmatically.
await runAndWaitForFrameUpdate(() => {
target.style.animationRangeEnd = "cover 100%";
});
assert_percents_equal(
anim.currentTime, 100/6,
'Current time unchanged after change to ignored CSS property');
assert_equals(
getComputedStyle(target).marginLeft, '50px',
'Margin-left unaffected by change to ignored CSS property');
}, 'Animation API call rangeEnd overrides animation-range-end');
}
window.onload = runTest;
</script>
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