1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
<!DOCTYPE html>
<meta charset="utf-8">
<title>ScrollTimeline current time algorithm - root scroller</title>
<link rel="help" href="https://wicg.github.io/scroll-animations/#current-time-algorithm">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
html {
/* Ensure the document is scrollable. */
min-height: 100%;
min-width: 100%;
padding-bottom: 100px;
padding-right: 100px;
}
</style>
<script>
test(function() {
const scroller = document.scrollingElement;
// Set the timeRange(s) such that currentTime maps directly to the value
// scrolled. This makes it easier to assert on the currentTime in the test.
const scrollerHeight = scroller.scrollHeight - scroller.clientHeight;
const scrollerWidth = scroller.scrollWidth - scroller.clientWidth;
const blockScrollTimeline = new ScrollTimeline(
{ scrollSource: scroller, timeRange: scrollerHeight, orientation: 'block' });
const inlineScrollTimeline = new ScrollTimeline(
{ scrollSource: scroller, timeRange: scrollerWidth, orientation: 'inline' });
// Unscrolled, both timelines should read a currentTime of 0.
assert_equals(blockScrollTimeline.currentTime, 0);
assert_equals(inlineScrollTimeline.currentTime, 0);
// Now do some scrolling and make sure that the ScrollTimelines update.
scroller.scrollTop = 50;
scroller.scrollLeft = 75;
// As noted above, the timeRange(s) are mapped such that currentTime should be
// the scroll offset.
assert_equals(blockScrollTimeline.currentTime, 50);
assert_equals(inlineScrollTimeline.currentTime, 75);
}, 'currentTime calculates the correct time for a document.scrollingElement scrollSource');
</script>
|
