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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title> CSS Scroll Snap 2 Test: scroll-start-target*</title>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-2/#scroll-start-target">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/dom/events/scrolling/scroll_support.js"></script>
</head>
<body>
<style>
#space {
width: 1000px;
height: 1000px;
border: solid 1px red;
}
#scroller {
width: 400px;
height: 400px;
overflow: hidden;
border: solid 1px blue;
position: absolute;
}
#target {
width: 100px;
height: 100px;
background-color: pink;
scroll-start-target: auto auto;
position: absolute;
top: 400px;
left: 400px;
}
</style>
<div id="scroller">
<div id="space"></div>
<div id="target"></div>
</div>
<script>
promise_test(async (t) => {
await waitForCompositorCommit();
assert_equals(scroller.scrollTop, 400,
"scroller is vertically scrolled to target");
assert_equals(scroller.scrollLeft, 400,
"scroller is horizontally scrolled to target");
target.style.scrollSnapAlign = "center";
await waitForCompositorCommit();
assert_equals(scroller.scrollTop, 250,
"scroller is vertically aligned to target's center");
assert_equals(scroller.scrollLeft, 250,
"scroller is horizontally aligned to target's center");
target.style.scrollSnapAlign = "end";
await waitForCompositorCommit();
assert_equals(scroller.scrollTop, 100,
"scroller is vertically aligned to target's bottom");
assert_equals(scroller.scrollLeft, 100,
"scroller is horizontally aligned to target's right");
target.style.scrollSnapAlign = "start";
await waitForCompositorCommit();
assert_equals(scroller.scrollTop, 400,
"scroller is vertically aligned to target's top");
assert_equals(scroller.scrollLeft, 400,
"scroller is horizontally aligned to target's left");
}, "scroll-start-target aligns with scroll-snap-align");
</script>
</body>
</html>
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