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<!DOCTYPE html>
<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
<link rel="help" href="https://www.w3.org/TR/CSS22/box.html#collapsing-margins" title="8.3.1 Collapsing margins">
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div style="width: 100px; height: 100px; background: green;"></div>
<div style="width: 0; height: 0; outline: solid red 50px; position: relative; z-index: 1; overflow: clip; margin-left: 50px;">
  <div id="target"></div>
</div>
<script>
document.body.offsetTop;
document.getElementById('target').style.marginTop = '-1000px';
</script>