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<!DOCTYPE html>
<meta charset="utf-8">
<link rel="help" href="https://drafts.csswg.org/css-scroll-anchoring-1/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
body { margin: 0; }
#scroller {
overflow: scroll;
height: 100px;
}
#multicol {
margin-top: 20px;
height: 200px;
columns: 2;
column-fill: auto;
}
#before {
margin-top: 100px;
height: 100px;
}
#content {
height: 10px;
}
</style>
<div id="scroller">
<div id="multicol">
<div id="fragmented">
<div id="before"></div>
<div id="content">content</div>
</div>
</div>
</div>
<script>
// Tests a scroll anchor inside of a div fragmented across multicol
test(() => {
let scroller = document.querySelector("#scroller");
let before = document.querySelector("#before");
let content = document.querySelector("#content");
// Scroll down so that we select a scroll anchor. We should select #content
// and not #before, as #before is positioned offscreen in the first column
scroller.scrollTop = 10;
// Increase the height of #before so that it fragments into the second
// column and pushes #content down.
before.style.height = "110px";
// We should have anchored to #content and have done an adjustment of 10px
assert_equals(scroller.scrollTop, 20);
}, "An element in a fragmented div should be able to be selected as an anchor node.");
</script>
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