<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-scroll-anchoring/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
body { height: 4000px; }
div { height: 100px; }
.scroller {
overflow: scroll;
position: fixed;
width: 300px;
height: 300px;
background-color: green;
}
#posSticky {
top: 300px;
position: relative;
height: 50px;
width: 50px;
background-color: blue;
}
#content {
background-color: #D3D3D3;
height: 50px;
width: 50px;
position: relative;
top: 500px;
}
</style>
<div id="scroller" class="scroller">
<div id="content"></div>
<div id="posSticky">
<div id="block1" tabindex="-1">abc</div>
</div>
</div>
<script>
// Tests that a focused element doesn't become the
// priority candidate of the main frame if it is
// in an excluded subtree
promise_test(async function() {
var scroller = document.querySelector("#scroller");
var focusElement = document.querySelector("#block1");
focusElement.focus();
scroller.scrollBy(0,150);
document.scrollingElement.scrollBy(0,100);
await new Promise(resolve => {
document.addEventListener("scroll", () => step_timeout(resolve, 0));
});
assert_equals(document.scrollingElement.scrollTop, 100);
}, "Ensure there is no scroll anchoring adjustment in the main frame.");
</script>
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