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<!DOCTYPE html>
<html>
<head>
<title>Scrollable overflow of Document element with 'position: fixed' which has ICB as containing block</title>
<link rel="author" title="Jo Steven Novaryo" href="mailto:jo.steven.novaryo@huawei.com">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
</body>
<script>
promise_test(async (t) => {
let initialScrollHeight = document.scrollingElement.scrollHeight;
let initialScrollWidth = document.scrollingElement.scrollWidth;
let fixedDiv = document.createElement("div");
fixedDiv.style.position = "fixed";
fixedDiv.style.height = (initialScrollHeight * 2) + "px";
fixedDiv.style.width = (initialScrollWidth * 2) + "px";
document.body.appendChild(fixedDiv);
assert_equals(document.scrollingElement.scrollHeight, initialScrollHeight);
assert_equals(document.scrollingElement.scrollWidth, initialScrollWidth);
}, "position: fixed fixed with ICB as CB should not affect scrollable overflow of Document element.");
</script>
</html>