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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /css/css-scroll-snap/snap-to-zero-height-interior-area.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<meta charset="utf-8">
<title>A zero-height snap area can be snapped to</title>
<meta name="assert" content="A snap area with zero extent along the scroll axis is still a valid snap target.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#scroller {
width: 300px;
height: 400px;
overflow: scroll;
scroll-snap-type: y mandatory;
}
#scroller > div {
width: 100%;
}
.snap-start {
scroll-snap-align: start;
}
.block {
height: 400px;
}
.spacer {
height: 200px;
}
.marker {
height: 0;
}
</style>
<div id="scroller">
<div class="snap-start block"></div>
<div class="spacer"></div>
<div class="snap-start marker"></div>
<div class="spacer"></div>
<div class="snap-start block"></div>
</div>
<script>
const scroller = document.getElementById("scroller");
[
[600, 600], // exact: the empty area is itself a valid resting position
[550, 600], // approaching from above: 600 is the nearest snap offset
[650, 600], // approaching from below: 600 is the nearest snap offset
].forEach(([destination, expected]) => {
test(() => {
scroller.scrollTo(0, 0);
assert_equals(scroller.scrollTop, 0, "reset to top");
scroller.scrollTop = destination;
assert_equals(scroller.scrollTop, expected);
}, `scrollTop = ${destination} snaps to the zero-height area at ${expected}`);
});
</script>