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Test Info: Warnings
- This test has a WPT meta file that expects 3 subtest issues.
- This WPT test may be referenced by the following Test IDs:
- /scroll-animations/view-timelines/view-timeline-source.tentative.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<html id="top">
<meta charset="utf-8">
<title>View timeline source</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<style>
#outer {
height: 400px;
width: 400px;
overflow: clip;
}
#inner {
height: 300px;
width: 300px;
overflow: clip;
}
#outer.scroller,
#inner.scroller {
overflow: scroll;
}
#spacer {
height: 1000px;
}
#target {
background: green;
height: 40px;
width: 40px;
}
</style>
<body>
<div id="outer" class="scroller">
<div id="inner" class="scroller">
<div id="target"></div>
<div id="spacer"></div>
</div>
</div>
</body>
<script>
'use strict';
function resetScrollers() {
inner.classList.add('scroller');
outer.classList.add('scroller');
}
function assert_source_id(viewTimeline, expected) {
const source = viewTimeline.source;
assert_true(!!source, 'No source');
assert_equals(source.id, expected);
}
promise_test(async t => {
t.add_cleanup(resetScrollers);
const viewTimeline = new ViewTimeline({ subject: target });
assert_equals(viewTimeline.subject, target);
assert_source_id(viewTimeline, 'inner');
inner.classList.remove('scroller');
assert_source_id(viewTimeline, 'outer');
outer.classList.remove('scroller');
assert_source_id(viewTimeline, 'top');
}, 'Default source for a View timeline is the nearest scroll ' +
'ancestor to the subject');
promise_test(async t => {
t.add_cleanup(resetScrollers);
const viewTimeline =
new ViewTimeline({ source: outer, subject: target });
assert_equals(viewTimeline.subject, target);
assert_source_id(viewTimeline, 'inner');
}, 'View timeline ignores explicitly set source');
promise_test(async t => {
t.add_cleanup(resetScrollers);
const viewTimeline =
new ViewTimeline({ subject: target });
assert_equals(viewTimeline.subject, target);
assert_source_id(viewTimeline, 'inner');
target.style = "display: none";
assert_equals(viewTimeline.source, null);
}, 'View timeline source is null when display:none');
</script>
</html>