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chromium/third_party/blink/web_tests/external/wpt/css/CSS2/abspos/adjacent-to-relpos-inline-in-inline-that-had-block.html 

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="[email protected]">
<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>