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<!DOCTYPE html>
<html id="top">
<head>
<meta charset="utf-8">
<title>View timeline with sticky during entry/exit</title>
<link rel="help" href="https://drafts.csswg.org/scroll-animations-1/#viewtimeline-interface">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<script src="/scroll-animations/scroll-timelines/testcommon.js"></script>
<script src="/scroll-animations/view-timelines/testcommon.js"></script>
<style>
#container {
height: 500px;
overflow: auto;
}
.space {
height: 550px;
}
/* target > viewport, bottom-sticky during entry and top-sticky during exit */
.stickycase6 {
background: yellow;
position: sticky;
top: -200px;
bottom: -200px;
height: 700px;
}
#target {
position: relative;
top: 50px;
background: orange;
height: 600px;
}
.space:has(.stickycase6),
.space:has(.stickycase7) {
height: 1050px;
}
</style>
</head>
<body>
<div id="container">
<div class="space"></div>
<div class="space">
<div style="height: 150px"></div>
<div id="sticky" class="stickycase6">
<div id="target">Subject</div>
</div>
</div>
<div class="space"></div>
</div>
<script type="text/javascript">
// The "cover" range would be [STATIC_START, STATIC_END] if we ignored
// stickiness (i.e., considered only static position).
//
// STATIC_START = scroll distance to second spacer (50px)
// + position of sticky element within its container (150px)
// + position of target within sticky element (50px)
// STATIC_END = STATIC_START
// + viewport height (500px)
// + target height (100px)
const STATIC_START = 250;
const BIG_TARGET_STATIC_END = 1350;
// This is how far the sticky element can move upwards when bottom-stuck.
const ROOM_ABOVE = 150;
// This is how far the sticky element can move downwards when top-stuck.
const ROOM_BELOW = 200;
const BIG_TARGET_HEIGHT = 600;
const VIEWPORT_HEIGHT = 500;
promise_test(async t => {
await runTimelineRangeTest(t, {
rangeStart: { rangeName: 'cover', offset: CSS.percent(0) } ,
rangeEnd: { rangeName: 'cover', offset: CSS.percent(100) },
startOffset: STATIC_START - ROOM_ABOVE,
endOffset: BIG_TARGET_STATIC_END + ROOM_BELOW,
axis: 'block'
});
await runTimelineRangeTest(t, {
rangeStart: { rangeName: 'contain', offset: CSS.percent(0) } ,
rangeEnd: { rangeName: 'contain', offset: CSS.percent(100) },
startOffset: STATIC_START + VIEWPORT_HEIGHT,
endOffset: BIG_TARGET_STATIC_END - VIEWPORT_HEIGHT,
axis: 'block'
});
await runTimelineRangeTest(t, {
rangeStart: { rangeName: 'entry', offset: CSS.percent(0) },
rangeEnd: { rangeName: 'entry', offset: CSS.percent(100) },
startOffset: STATIC_START - ROOM_ABOVE,
endOffset: STATIC_START + VIEWPORT_HEIGHT,
axis: 'block'
});
await runTimelineRangeTest(t, {
rangeStart: { rangeName: 'entry-crossing', offset: CSS.percent(0) },
rangeEnd: { rangeName: 'entry-crossing', offset: CSS.percent(100) },
startOffset: STATIC_START - ROOM_ABOVE,
endOffset: BIG_TARGET_STATIC_END - VIEWPORT_HEIGHT,
axis: 'block'
});
await runTimelineRangeTest(t, {
rangeStart: { rangeName: 'exit', offset: CSS.percent(0) },
rangeEnd: { rangeName: 'exit', offset: CSS.percent(100) },
startOffset: BIG_TARGET_STATIC_END - VIEWPORT_HEIGHT,
endOffset: BIG_TARGET_STATIC_END + ROOM_BELOW,
axis: 'block'
});
await runTimelineRangeTest(t, {
rangeStart: { rangeName: 'exit-crossing', offset: CSS.percent(0) },
rangeEnd: { rangeName: 'exit-crossing', offset: CSS.percent(100) },
startOffset: STATIC_START + VIEWPORT_HEIGHT,
endOffset: BIG_TARGET_STATIC_END + ROOM_BELOW,
axis: 'block'
});
}, 'View timeline target > viewport, ' +
'bottom-sticky during entry and top-sticky during exit.');
</script>
</body>
</html>
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