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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Test: scroll tracking for ::scroll-marker with overflow: hidden</title>
<link rel="help" href="https://drafts.csswg.org/css-overflow-5/#scroll-container-scroll">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/css-transitions/support/helper.js"></script>
<style>
#scroller {
overflow: scroll;
scroll-marker-group: before;
height: 100px;
}
#scroller::scroll-marker-group {
border: 3px solid black;
display: flex;
width: 100px;
height: 20px;
}
#scroller div {
width: 100px;
height: 100px;
}
#scroller div::scroll-marker {
overflow: hidden;
content: '';
background-color: red;
display: inline-flex;
width: 10px;
height: 10px;
border-radius: 50%;
}
#scroller div::scroll-marker:target-current {
background-color: green;
}
</style>
<div id='scroller'>
<div></div>
<div id='target'></div>
</div>
<script>
function assertPseudoElementProperty(originatingElement, pseudoType, backgroundColor) {
const pseudoStyle = getComputedStyle(originatingElement, pseudoType);
const pseudoBackgroundColor = pseudoStyle.getPropertyValue('background-color');
assert_equals(pseudoBackgroundColor, backgroundColor, pseudoType +
" background-color should be " + backgroundColor.toString() +
" but was " + pseudoBackgroundColor.toString());
}
promise_test(async () => {
await waitForAnimationFrames(2);
assertPseudoElementProperty(target, "::scroll-marker", "rgb(255, 0, 0)");
}, "::scroll-marker is not activated when its originating element is not scrolled into the view");
promise_test(async () => {
scroller.scrollTop = 150;
await waitForAnimationFrames(2);
assertPseudoElementProperty(target, "::scroll-marker", "rgb(0, 128, 0)");
}, "::scroll-marker is activated when its originating element is scrolled into the view");
</script>
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