mozilla-central/testing/web-platform/tests/dom/events/scrolling/wheel-event-transactions-target-resize.html

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Test Info:

<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
<meta name="variant" content="?include=passive-false"/>
<meta name="variant" content="?include=passive-true"/>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="/common/subset-tests-by-key.js"></script>
<script src="scroll_support.js"></script>
<style>
body {
margin: 0;
padding: 0;
height: 200vh;
}
.spacer {
width: 100%;
height: 25px;
padding: 0;
margin: 0;
}
</style>
<head>
<body onload=runTest()>
<div id="initialTarget" class="spacer" style="background: red"></div>
<div id="firstRootSpacer" class="spacer" style="background: green"></div>
<div id="secondRootSpacer" class="spacer" style="background: blue"></div>
</body>
<script>
let variants = [
{
key: "passive-false",
passive: false,
},
{
key: "passive-true",
passive: true,
},
];
function runTest() {
async function testResizeTarget(passive, t) {
await waitForCompositorReady();
await waitForCompositorCommit();
let wheelEventTargets = [];
let resizedInitialTarget = false;
// Resize the initial element the wheel event is targetted at once we fire the
// first wheel event, then log the subsequent wheel event targets.
function resizeInitialElement(e) {
wheelEventTargets.push(e.target);
if (!resizedInitialTarget) {
resizedInitialTarget = true;
e.target.style.height = '10px';
}
}
window.addEventListener("wheel", resizeInitialElement, {passive: passive});
await waitForCompositorCommit();
await new test_driver.Actions()
.addWheel("wheel1")
.scroll(2, 2, 0, 30, {origin: "viewport"})
.pause(1)
.scroll(2, 2, 0, 30, {origin: "viewport"})
.send();
// TODO(dlrobertson): Use the scrollend event here to wait for the
// wheel scroll to finish instead of waitForAnimationEnd().
await waitForAnimationEnd(() => { return document.scrollingElement.scrollTop; });
await waitForCompositorCommit();
wheelEventTargets.forEach((wheelEventTarget, i) => {
assert_equals(wheelEventTarget, initialTarget,
"Wheel event at `" + i + "` does not match the expected target")
});
assert_greater_than(document.scrollingElement.scrollTop, 0, "The document has scrolled");
}
variants.forEach((variant) => {
subsetTestByKey(variant.key, promise_test, t => testResizeTarget(variant.passive, t),
"Resize the initial target and use a passive:" + variant.passive + " listener");
});
}
</script>
</html>