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<!doctype html>
<meta charset=utf-8>
<title>Effect composition</title>
<link rel="help" href="https://drafts.csswg.org/web-animations/#effect-composition">
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script src="../../testcommon.js"></script>
<div id="log"></div>
<script>
'use strict';
for (const composite of ['accumulate', 'add']) {
test(t => {
const div = createDiv(t);
div.style.marginLeft = '10px';
const anim =
div.animate({ marginLeft: ['0px', '10px'], composite }, 100);
anim.currentTime = 50;
assert_equals(getComputedStyle(div).marginLeft, '15px',
'Animated margin-left style at 50%');
}, `${composite} onto the base value`);
test(t => {
const div = createDiv(t);
const anims = [];
anims.push(div.animate({ marginLeft: ['10px', '20px'],
composite: 'replace' },
100));
anims.push(div.animate({ marginLeft: ['0px', '10px'],
composite },
100));
for (const anim of anims) {
anim.currentTime = 50;
}
assert_equals(getComputedStyle(div).marginLeft, '20px',
'Animated style at 50%');
}, `${composite} onto an underlying animation value`);
test(t => {
const div = createDiv(t);
div.style.marginLeft = '10px';
const anim =
div.animate([{ marginLeft: '10px', composite },
{ marginLeft: '30px', composite: 'replace' }],
100);
anim.currentTime = 50;
assert_equals(getComputedStyle(div).marginLeft, '25px',
'Animated style at 50%');
}, `Composite when mixing ${composite} and replace`);
test(t => {
const div = createDiv(t);
div.style.marginLeft = '10px';
const anim =
div.animate([{ marginLeft: '10px', composite: 'replace' },
{ marginLeft: '20px' }],
{ duration: 100 , composite });
anim.currentTime = 50;
assert_equals(getComputedStyle(div).marginLeft, '20px',
'Animated style at 50%');
}, `${composite} specified on a keyframe overrides the composite mode of`
+ ' the effect');
test(t => {
const div = createDiv(t);
div.style.marginLeft = '10px';
const anim =
div.animate([{ marginLeft: '10px', composite: 'replace' },
{ marginLeft: '20px' }],
100);
anim.effect.composite = composite;
anim.currentTime = 50; // (10 + (10 + 20)) * 0.5
assert_equals(getComputedStyle(div).marginLeft, '20px',
'Animated style at 50%');
}, 'unspecified composite mode on a keyframe is overriden by setting'
+ ` ${composite} of the effect`);
}
</script>
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