mozilla-central/testing/web-platform/tests/dom/events/scrolling/wheel-event-transactions-basic.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=target-basic"/>
<meta name="variant" content="?include=scroll-over-scrollable-child"/>
<meta name="variant" content="?include=transaction-not-bound-to-scroll-frame"/>
<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;
}
#scrollableDiv {
width: 100%;
height: 500px;
overflow: scroll;
background: yellow;
}
#innerDiv {
width: 100%;
height: 4000px;
background: red;
}
</style>
<head>
<body onload=runTest()>
<div id="firstRootSpacer" class="spacer" style="background: cyan"></div>
<div id="secondRootSpacer" class="spacer" style="background: magenta"></div>
<div id="scrollableDiv">
<div id="innerDiv">
<div id="firstInnerSpacer" class="spacer" style="background: green">
</div>
<div id="secondInnerSpacer" class="spacer" style="background: blue">
</div>
</div>
</div>
</body>
<script>
let variants = [
// Ensure that the wheel transaction fires all wheel events to the initial
// target.
{
key: 'target-basic',
origin: "viewport",
scrollX: 40,
scrollY: 2,
scrollingElement: document.scrollingElement,
targetElement: firstRootSpacer,
title: 'Wheel events should be captured to one target #1',
},
// Ensure that the wheel transaction fires all wheel events to the initial
// target, even when another scroll frame is under the mouse cursor.
{
key: 'scroll-over-scrollable-child',
origin: "viewport",
scrollX: 40,
scrollY: 27,
scrollingElement: document.scrollingElement,
targetElement: secondRootSpacer,
title: 'Wheel events should be captured to one target #2',
},
// Ensure that the wheel transaction targets the topmost-element, which is
// not the scrollable element.
{
key: 'transaction-not-bound-to-scroll-frame',
origin: innerDiv,
scrollX: 40,
scrollY: 2,
scrollingElement: scrollableDiv,
targetElement: innerDiv,
title: 'The wheel event transactions target may not be a scroll frame',
},
];
function runTest() {
async function testBasic(testInfo, t) {
await waitForCompositorReady();
await waitForCompositorCommit();
let wheelEventTargets = [];
function pushTargetToWheelEventTargets(e) {
wheelEventTargets.push(e.target)
}
window.addEventListener("wheel", pushTargetToWheelEventTargets, {passive: true});
// Scroll past the boundary of the original element to ensure all events in
// transaction have the same target.
await new test_driver.Actions()
.addWheel("wheel1")
.scroll(testInfo.scrollX, testInfo.scrollY, 0, 30, {origin: testInfo.origin})
.pause(1)
.scroll(testInfo.scrollX, testInfo.scrollY, 0, 30, {origin: testInfo.origin})
.pause(1)
.scroll(testInfo.scrollX, testInfo.scrollY, 0, 30, {origin: testInfo.origin})
.send();
// TODO(dlrobertson): Use the scrollend event here to wait for the
// wheel scroll to finish instead of waitForAnimationEnd().
await waitForAnimationEnd(() => { return testInfo.scrollingElement.scrollTop; });
await waitForCompositorCommit();
// Ensure that all the captured wheel events are the expected target.
wheelEventTargets.forEach((wheelEventTarget, i) => {
assert_equals(wheelEventTarget, testInfo.targetElement,
"Wheel event at index `" + i + "` does not have the expected target");
});
assert_greater_than(testInfo.scrollingElement.scrollTop, 0,
"The scrolling element has scrolled");
}
variants.forEach((testInfo) => {
subsetTestByKey(testInfo.key, promise_test, t => testBasic(testInfo, t), testInfo.title);
});
}
</script>
</html>