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<!doctype html>
<meta charset="utf-8">
<title>CSS Test: :target-before and :target-after on ::scroll-marker</title>
<link rel="help" href="https://drafts.csswg.org/css-overflow-5/#scroll-marker-pseudo">
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11600">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/css-transitions/support/helper.js"></script>
<style>
.scroller {
width: 600px;
height: 300px;
overflow: scroll;
scroll-marker-group: after;
}
.scroller div {
width: 600px;
height: 300px;
margin-bottom: 20px;
background: green;
}
.scroller::scroll-marker-group {
border: 3px solid black;
padding: 5px;
height: 20px;
display: block;
}
.scroller div::scroll-marker {
content: "";
width: 10px;
height: 10px;
background-color: blue;
border-radius: 100%;
display: inline-block;
}
.scroller div::scroll-marker:target-current {
background-color: green;
}
.scroller div::scroll-marker:target-before {
background-color: red;
}
.scroller div::scroll-marker:target-after {
background-color: yellow;
}
</style>
<div class="scroller">
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
</div>
<script>
function checkScrollMarkers(markerTargets, targetCurrentIndex) {
for (let i = 0; i < markerTargets.length; ++i) {
if (i < targetCurrentIndex) {
assert_equals(getComputedStyle(markerTargets[i], "::scroll-marker").backgroundColor, "rgb(255, 0, 0)", "::scroll-marker before the :target-current one should be red as :target-before");
} else if (i === targetCurrentIndex) {
assert_equals(getComputedStyle(markerTargets[i], "::scroll-marker").backgroundColor, "rgb(0, 128, 0)", "the :target-current ::scroll-marker should be green");
} else {
assert_equals(getComputedStyle(markerTargets[i], "::scroll-marker").backgroundColor, "rgb(255, 255, 0)", "::scroll-marker before the :target-current one should be yellow as :target-after");
}
}
}
const scroller = document.querySelector(".scroller");
const markerTargets = scroller.querySelectorAll("div");
for (let i = 0; i < markerTargets.length; ++i) {
promise_test(async t => {
// Make i-th scroll marker :target-current.
markerTargets[i].scrollIntoView();
await waitForAnimationFrames(2);
// Check the :target-before/:target-after relations on all scroll markers.
checkScrollMarkers(markerTargets, i);
}, i + "th scroll marker test");
}
</script>
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