mozilla-central/layout/base/tests/chrome/test_will_change.html

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Test Info: Warnings

<!DOCTYPE HTML>
<html>
<head>
<title>Tests for MozAfterPaint</title>
<style>
div {
width: 100px;
height: 100px;
background: radial-gradient(ellipse at center, #87e0fd 0%,#53cbf1 40%,#05abe0 100%);
}
</style>
</head>
<body>
</body>
<script>
var utils = window.windowUtils;
function waitForPaints() {
return new Promise(function(resolve, reject) {
waitForAllPaintsFlushed(resolve);
});
}
add_task(async () => {
var element = document.createElement("div");
document.body.appendChild(element);
await waitForPaints();
utils.checkAndClearPaintedState(element);
element.style.opacity = "0.5";
await waitForPaints();
var painted = utils.checkAndClearPaintedState(element);
// *** We check that this repaints because the test is relying
// on this property. If this is broken then this test wont
// be reliable check for will-change.
is(painted, true, "element should have been painted");
element.remove();
});
add_task(async () => {
var element = document.createElement("div");
document.body.appendChild(element);
element.style.willChange = "opacity";
await waitForPaints();
utils.checkAndClearPaintedState(element);
element.style.opacity = "0.5";
await waitForPaints();
var painted = utils.checkAndClearPaintedState(element);
// BasicLayers' heuristics are so that even with will-change:opacity,
// we can still have repaints.
if (utils.layerManagerType != "Basic") {
is(painted, false, "will-change:opacity element should not have been painted");
}
element.remove();
});
add_task(async () => {
var element = document.createElement("div");
document.body.appendChild(element);
element.style.willChange = "transform";
await waitForPaints();
utils.checkAndClearPaintedState(element);
element.style.transform = "translateY(-5px)";
await waitForPaints();
var painted = utils.checkAndClearPaintedState(element);
// BasicLayers' heuristics are so that even with will-change:transform,
// we can still have repaints.
if (utils.layerManagerType != "Basic") {
is(painted, false, "will-change:transform element should not have been painted");
}
element.remove();
});
add_task(async () => {
var element = document.createElement("div");
document.body.appendChild(element);
element.style.willChange = "translate";
await waitForPaints();
utils.checkAndClearPaintedState(element);
element.style.translate = "5px";
await waitForPaints();
var painted = utils.checkAndClearPaintedState(element);
// BasicLayers' heuristics are so that even with will-change:translate,
// we can still have repaints.
if (utils.layerManagerType != "Basic") {
is(painted, false, "will-change:translate element should not have been painted");
}
element.remove();
});
add_task(async () => {
var element = document.createElement("div");
document.body.appendChild(element);
element.style.willChange = "offset-path";
await waitForPaints();
utils.checkAndClearPaintedState(element);
element.style.offsetPath = "path('M55 50 h1')";
await waitForPaints();
var painted = utils.checkAndClearPaintedState(element);
// BasicLayers' heuristics are so that even with will-change:offset-path,
// we can still have repaints.
if (utils.layerManagerType != "Basic") {
is(painted, false, "will-change:offset-path element should not have been painted");
}
element.remove();
});
</script>
</html>