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<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#unreachable" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
div {
position: absolute;
margin: 0px;
}
#scroller {
height: 500px;
width: 500px;
overflow: hidden;
scroll-snap-type: both mandatory;
}
#unreachable {
width: 300px;
height: 300px;
top: -100px;
left: -100px;
background-color: blue;
scroll-snap-align: start;
}
#reachable {
width: 300px;
height: 300px;
top: 400px;
left: 400px;
background-color: blue;
scroll-snap-align: start;
}
</style>
<div id="scroller">
<div style="width: 2000px; height: 2000px;"></div>
<div id="unreachable"></div>
<div id="reachable"></div>
</div>
<script>
test(() => {
// Firstly move to the reachable snap position.
scroller.scrollTo(400, 400);
assert_equals(scroller.scrollLeft, 400);
assert_equals(scroller.scrollTop, 400);
// Then move to a position between the unreachable snap position and the
// reachable position but closer to the unreachable one.
scroller.scrollTo(100, 100);
assert_equals(scroller.scrollLeft, 0);
assert_equals(scroller.scrollTop, 0);
}, "Snaps to the positions defined by the element as much as possible");
</script>
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