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scroll-snap-stop-002-nested.tentative.html
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<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap/#scroll-snap-stop" />
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#snap-overflow" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
div {
position: absolute;
}
.scroller {
width: 400px;
height: 100px;
overflow: scroll;
scroll-snap-type: x mandatory;
}
#space {
left: 0px;
top: 0px;
width: 2100px;
height: 50px;
}
.target {
width: 50px;
height: 50px;
scroll-snap-align: start;
top: 0px;
}
</style>
<div class="scroller" id="scroller7">
<div id="space"></div>
<div class="target" style="left: 0px;"></div>
<div class="target" style="left: 400px; width: 900px;"></div>
<div class="target" style="left: 900px; scroll-snap-stop: always;"></div
</div>
<script>
test(() => {
assert_equals(scroller7.scrollLeft, 0);
assert_equals(scroller7.scrollTop, 0);
// start dest always
// |-------------------------|================|=====|=====
// 0 400 700 900
// Scoll on the element whose snap area is larger than the snapport.
scroller7.scrollBy(600, 0);
// Stops before the smaller snap area @ 900px enters the snapport.
assert_equals(scroller7.scrollLeft + scroller7.clientWidth, 900);
assert_equals(scroller7.scrollTop, 0);
scroller7.scrollTo(0, 0);
scroller7.scrollBy(800, 0);
// Now the smaller snap area is closer, so we snap to it.
assert_equals(scroller7.scrollLeft, 900);
assert_equals(scroller7.scrollTop, 0);
}, "`scroll-snap-stop: always` snap point is further than the scroll " +
"destination and a snap area covers the snapport");
</script>