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+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mstensho@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/CSS22/visudet.html#containing-block-details">
+<link rel="help" href="https://www.w3.org/TR/CSS22/visuren.html#anonymous-block-level">
+<p>There should be a green square below, and no red.</p>
+<div style="position:relative; width:100px; height:100px; background:red;">
+ <span>
+ <span id="posMe">
+ <div id="removeMe"></div>
+ </span>
+ </span>
+ <span>
+ <div>
+ <div id="target" style="position:absolute; width:100%; height:100%; background:green;"></div>
+ </div>
+ </span>
+</div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+ test(()=> {
+ document.body.offsetTop;
+ removeMe.style.display = "none";
+ document.body.offsetTop;
+ posMe.style.position = "relative";
+ assert_equals(document.getElementById("target").offsetWidth, 100);
+ assert_equals(document.getElementById("target").offsetHeight, 100);
+ assert_equals(document.getElementById("target").offsetLeft, 0);
+ assert_equals(document.getElementById("target").offsetTop, 0);
+ }, "Make sure that we're sized by the right ancestor");
+</script>