70 lines
2.2 KiB
HTML
70 lines
2.2 KiB
HTML
<!DOCTYPE html>
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<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-snap-type" />
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<title>Mouse-wheel scroll snapping speed</title>
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<meta name="assert"
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content="Test passes if mousewheel snaps without pausing">
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<style>
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#scroller {
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scroll-snap-type: block mandatory;
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overflow: scroll;
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height: 400px;
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width: 400px
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}
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#space {
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width: 200px;
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height: 4000px;
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}
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.box {
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scroll-snap-align: start;
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background: blue;
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margin-bottom: 10px;
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width: 100px;
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height: 100px;
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}
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</style>
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="/resources/testdriver.js"></script>
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<script src="/resources/testdriver-vendor.js"></script>
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<script src="/resources/testdriver-actions.js"></script>
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<script src="../support/common.js"></script>
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<div id="scroller">
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<div class="box"></div>
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<div class="box"></div>
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<div id="space"></div>
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</div>
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<script>
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promise_test(async t => {
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const scroller = document.getElementById("scroller");
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scroller.scrollTo(0, 0);
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assert_equals(scroller.scrollTop, 0, "verify test pre-condition");
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const scrollTop = () => {
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return scroller.scrollTop;
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};
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const scrollPromise = waitForScrollEvent(scroller);
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const wheelPromise = waitForWheelEvent(scroller);
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const actions = new test_driver.Actions()
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.scroll(50, 50, 0, 50, {origin: scroller, duration: 100});
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await actions.send();
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await wheelPromise;
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await scrollPromise;
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let scrollEndTime;
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let snapEndTime;
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// Detect first pause in scrolling.
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const scrollStabilizedPromise =
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waitForAnimationEnd(scrollTop).then((timestamp) => {
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scrollEndTime = timestamp;
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});
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const snapEndPromise =
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waitForScrollTo(scroller, () => {
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return scroller.scrollTop;
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}, 110).then((evt) => {
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snapEndTime = evt.timestamp;
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});
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await Promise.all([scrollStabilizedPromise, snapEndPromise]);
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assert_equals(scroller.scrollTop, 110,
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'Failed to advance to next snap target');
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assert_true(snapEndTime < scrollEndTime,
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'Detected pause in scrolling before reaching snap target');
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}, "Wheel-scroll triggers snap to target position immediately.");
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</script>
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