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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Test: test that the scroll-marker of a target whose target position
has not been reached only gets selected when it is within half a scroll
port's distance from the current scroll offset</title>
<link rel="help" href="https://drafts.csswg.org/css-overflow-5/#example-d2ca6884">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="support/scroll-marker-support.js"></script>
<script src="/dom/events/scrolling/scroll_support.js"></script>
</head>
<body>
<style>
.wrapper {
display: grid;
justify-content: center;
position: relative;
}
.carousel {
width: 600px;
height: 512px;
overflow-x: scroll;
scroll-snap-type: x mandatory;
list-style-type: none;
scroll-behavior: smooth;
border: solid 2px grey;
padding-left: 0px;
white-space: nowrap;
position: relative;
&>.item {
height: 80%;
width: 120px;
border: 1px solid;
place-content: center;
background-color: white;
margin-right: 1200px;
display: inline-block;
&::scroll-marker {
content: ' ';
width: 35px;
height: 35px;
border: 3px solid gray;
border-radius: 50%;
margin: 3px;
background-color:red;
}
&::scroll-marker:target-current {
background-color: green;
}
}
scroll-marker-group: after;
&::scroll-marker-group {
height: 45px;
display: flex;
align-items: center;
justify-content: center;
border: solid 1px black;
border-radius: 30px;
}
}
</style>
<div id="wrapper" class="wrapper">
<div class="carousel" id="carousel">
<div class="item" id="item1" tabindex=0>1</div>
<div class="item" id="item2" tabindex=0>2</div>
</div>
</div>
<script>
RED = "rgb(255, 0, 0)";
GREEN = "rgb(0, 128, 0)";
promise_test(async (t) => {
await waitForCompositorCommit();
const items = carousel.querySelectorAll(".item");
assert_equals(carousel.scrollLeft, 0, "carousel is not scrolled");
verifySelectedMarker(0, items, GREEN, RED);
// Scroll a bit, but not enough to bring item2 into view. Item1 should
// still be selected.
let pos = item2.offsetLeft - carousel.clientWidth - 10;
await waitForScrollReset(t, carousel, pos);
verifySelectedMarker(0, items, GREEN, RED);
// Scroll a bit more; bring item2 into view but only into the second half
// of the scroll port. Item1 should still be selected.
pos = item2.offsetLeft - carousel.clientWidth + item2.offsetWidth;
await waitForScrollReset(t, carousel, pos);
verifySelectedMarker(0, items, GREEN, RED);
// Scroll to place item2 within the half a scroll port's width from the
// current scroll offset. Item2 should now be selected.
pos += carousel.clientWidth / 2;
await waitForScrollReset(t, carousel, pos);
verifySelectedMarker(1, items, GREEN, RED);
}, "target whose target position is not yet reached only get selected " +
"when its less than half a scroll port away.");
</script>
</body>
</html>
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