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44 lines
1.7 KiB
HTML
44 lines
1.7 KiB
HTML
<!DOCTYPE html>
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<meta charset="utf-8">
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<title>ScrollTimeline current time algorithm - root scroller</title>
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<link rel="help" href="https://wicg.github.io/scroll-animations/#current-time-algorithm">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<style>
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html {
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/* Ensure the document is scrollable. */
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min-height: 100%;
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min-width: 100%;
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padding-bottom: 100px;
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padding-right: 100px;
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}
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</style>
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<script>
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test(function() {
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const scroller = document.scrollingElement;
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// Set the timeRange(s) such that currentTime maps directly to the value
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// scrolled. This makes it easier to assert on the currentTime in the test.
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const scrollerHeight = scroller.scrollHeight - scroller.clientHeight;
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const scrollerWidth = scroller.scrollWidth - scroller.clientWidth;
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const blockScrollTimeline = new ScrollTimeline(
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{ scrollSource: scroller, timeRange: scrollerHeight, orientation: 'block' });
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const inlineScrollTimeline = new ScrollTimeline(
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{ scrollSource: scroller, timeRange: scrollerWidth, orientation: 'inline' });
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// Unscrolled, both timelines should read a currentTime of 0.
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assert_equals(blockScrollTimeline.currentTime, 0);
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assert_equals(inlineScrollTimeline.currentTime, 0);
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// Now do some scrolling and make sure that the ScrollTimelines update.
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scroller.scrollTop = 50;
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scroller.scrollLeft = 75;
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// As noted above, the timeRange(s) are mapped such that currentTime should be
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// the scroll offset.
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assert_equals(blockScrollTimeline.currentTime, 50);
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assert_equals(inlineScrollTimeline.currentTime, 75);
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}, 'currentTime calculates the correct time for a document.scrollingElement scrollSource');
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</script>
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