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[Reland]: Repaint when bgcolor animation is triggered #27801

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merged 1 commit into from
Mar 2, 2021
Merged

[Reland]: Repaint when bgcolor animation is triggered #27801

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10 changes: 10 additions & 0 deletions css/css-backgrounds/animations/one-element-transition-with-delay-ref.html
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Original file line number Diff line number Diff line change
@@ -0,0 +1,10 @@
<!DOCTYPE html>
<body>
<canvas id="canvas" width="100" height="100"></canvas>
</body>
<script>
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
ctx.fillStyle = 'rgb(100, 100, 0)';
ctx.fillRect(0, 0, 100, 100);
</script>
47 changes: 47 additions & 0 deletions css/css-backgrounds/animations/one-element-transition-with-delay.html
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Original file line number Diff line number Diff line change
@@ -0,0 +1,47 @@
<!DOCTYPE html>
<html class="reftest-wait">
<link rel="help" href="https://drafts.csswg.org/css-backgrounds-3/#background-color">
<link rel="match" href="one-element-transition-with-delay-ref.html">
<style>
.container {
width: 100px;
height: 100px;
background-color: rgb(0, 200, 0);
transition: background-color 200000ms steps(2) -99995ms;
}
</style>
<script src="/common/reftest-wait.js"></script>
<body>
<div class="container" id="target"></div>

<script>
// This test differs from "one-element-transition.html" because it runs the
// transition starting from the set background color, rather than using a
// delay to start in the middle of the transition. This tests a new codepath
// where the first frame of the transition has the original background color,
// which is why we need the transition fully running. Since we are using the
// step(2) in the animation, so it is enough to wait for 5ms and the animation
// should be in its mid-point, that's the time we should take screenshot.
let start_time;
function startTransition(timestamp) {
document.getElementById('target').style.backgroundColor = "rgb(200, 0, 0)";
requestAnimationFrame(startTimer);
}

function startTimer(timestamp) {
start_time = timestamp;
requestAnimationFrame(wait);
}

function wait(timestamp) {
if (timestamp - start_time <= 5) {
requestAnimationFrame(wait);
return;
}
takeScreenshot();
}

requestAnimationFrame(startTransition);
</script>
</body>
</html>