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<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-padding" />
<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;
}
#target {
width: 300px;
height: 300px;
background-color: blue;
}
</style>
<div id="scroller">
<div style="width: 2000px; height: 2000px;"></div>
<div id="target"></div>
</div>
<script>
test(() => {
scroller.style.scrollPadding = "100px";
target.style.scrollSnapAlign = "start";
target.style.left = "300px";
target.style.top = "300px";
scroller.scrollTo(0, 0);
// `target position (300px, 300px)` - `padding (100px, 100px)`.
assert_equals(scroller.scrollLeft, 200);
assert_equals(scroller.scrollTop, 200);
target.style.scrollSnapAlign = "end";
// `target position (300px, 300px)` + `target size (300px, 300px) +
// `padding (100px, 100px) - `scroller size (500px, 500px)`.
scroller.scrollTo(0, 0);
assert_equals(scroller.scrollLeft, 200);
assert_equals(scroller.scrollTop, 200);
}, "Snaps to the positions adjusted by scroll-padding");
</script>
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