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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Overflow: ::scroll-marker with ::scroll-marker-group on root element scroll tracking</title>
<link rel="help" href="https://drafts.csswg.org/css-overflow-5/#scroll-marker-pseudo">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<style>
body {
margin: 0;
}
:root {
scroll-marker-group: before;
}
:root::scroll-marker-group {
border: 3px solid black;
padding: 5px;
height: 20px;
display: block;
position: fixed;
top: 0;
}
div {
width: 600px;
height: 300px;
margin-bottom: 20px;
background: blue;
}
div:first-of-type {
margin-top: 40px;
}
div::scroll-marker {
content: "";
width: 20px;
height: 20px;
background-color: red;
display: inline-block;
margin-right: 4px;
}
div::scroll-marker:target-current {
background-color: green;
}
div:last-of-type::scroll-marker {
margin-right: 0px;
}
</style>
<div></div>
<div></div>
<div id="target"></div>
<script>
promise_test(async t => {
await new test_driver.Actions()
.pointerMove(65, 20)
.pointerDown()
.pointerUp()
.pointerDown()
.pointerUp()
.send();
assert_equals(window.scrollY, 380);
assert_equals(getComputedStyle(target, "::scroll-marker").backgroundColor, "rgb(0, 128, 0)");
});
</script>
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