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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>transition timing function</title>
<link rel="help" href="https://drafts.csswg.org/css-transitions-1/#transition-timing-function-property">
<style>
.box {
position: relative;
left: 0;
height: 100px;
width: 100px;
margin: 10px;
background-color: blue;
transition: left 1s linear;
}
.animating > .box {
left: 400px;
}
</style>
</head>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/css-transitions/support/helper.js"></script>
<script src="/css/css-easing/testcommon.js"></script>
<script>
window.onload = () => {
function verifyPosition(element_id, expected) {
const element = document.getElementById(element_id);
const actual = Math.round(parseFloat(getComputedStyle(element).left));
assert_equals(actual, expected, `verify ${element_id} left`);
}
function easing(x1, y1, x2, y2) {
return Math.round(400 * cubicBezier(x1, y1, x2, y2)(0.5));
}
function ease() {
return easing(0.25, 0.1, 0.25, 1); // 321
}
function easeIn() {
return easing(0.42, 0, 1, 1); // 126
}
function easeOut() {
return easing(0.0, 0.0, 0.58, 1.0); // 274
}
function easeInOut() {
return easing(0.42, 0.0, 0.58, 1.0); // 200
}
promise_test(async t => {
// Make sure we have rendered the page before making the style change
// to ensure we get transitions.
await waitForAnimationFrames(2);
promises = [];
document.getElementById('container').className = 'animating';
document.getAnimations().forEach(anim => {
anim.pause();
anim.currentTime = 500;
promises.push(anim.ready);
});
Promise.all(promises).then(() => {
assert_equals(promises.length, 5, 'Unexpected animation count');
verifyPosition('box1', 200); // linear easing
verifyPosition('box2', ease());
verifyPosition('box3', easeIn());
verifyPosition('box4', easeOut());
verifyPosition('box5', easeInOut());
});
}, 'Ensure that transition easing functions are properly applied.');
};
</script>
<body>
<div id="container">
<div id="box1" class="box" style="transition-timing-function: linear;"></div>
<div id="box2" class="box" style="transition-timing-function: ease;"></div>
<div id="box3" class="box" style="transition-timing-function: ease-in;"></div>
<div id="box4" class="box" style="transition-timing-function: ease-out;"></div>
<div id="box5" class="box" style="transition-timing-function: ease-in-out;"></div>
</div>
</body>
</html>
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