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Test Info:

<!doctype html>
<meta charset=utf-8>
<title></title>
<link rel=match href=hypothetical-box-scroll-viewport-ref.html>
<link rel="help"
<div style="position: absolute">Original text</div>
<div style="width: 200vw; height: 10px"></div>
<script>
// Scroll the viewport.
window.scrollTo(window.innerWidth * 2, 0);
// Now force relayout of the abs pos div.
document.querySelector("div").textContent = "Modified text";
</script>