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<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-snap-align">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../support/common.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/dom/events/scrolling/scroll_support.js"></script>
<style>
.scroller {
height: 150px;
width: 300px;
overflow: auto;
position: relative;
white-space: nowrap;
scroll-snap-type: x mandatory;
}
.padding {
padding: 0 200px;
}
.child {
scroll-snap-align: center;
display: inline-block;
width: 201px;
height: 100%;
margin: 0 200px;
background-color: blue;
}
</style>
<div class="scroller" id="scroller1">
<div class="padding">
<div class="child"></div>
<div class="child"></div>
</div>
</div>
<div class="scroller" id="scroller2">
<div class="padding">
<div class="child"></div>
<div class="child"></div>
</div>
</div>
<script>
promise_test(async () => {
// Scroll to the second child.
let scrollEndPromise = waitForScrollEndFallbackToDelayWithoutScrollEvent(scroller2);
scroller2.scrollTo(scroller2.scrollWidth, 0);
await scrollEndPromise;
assert_greater_than(scroller2.scrollLeft, scroller1.scrollLeft);
// Scroll back to the first child.
scrollEndPromise = waitForScrollEndFallbackToDelayWithoutScrollEvent(scroller2);
await keyPress(scroller2, "ArrowLeft");
await scrollEndPromise;
// After scrolling to snap to the same child, both scrollers should have the
// same scroll position.
assert_equals(scroller2.scrollLeft, scroller1.scrollLeft);
}, "initial scroll snap matches scrolling scroll snap position.");
</script>
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