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<!doctype html>
<meta charset=utf-8>
<script>
'use strict';
window.onmessage = () => {
  const innerNode = window.document.getElementById("inner-node");
  const wrappedNode = SpecialPowers.wrap(innerNode);
  const wrappedQuads = wrappedNode.getBoxQuadsFromWindowOrigin();
  const quad = SpecialPowers.unwrap(wrappedQuads[0]);

  window.parent.postMessage({ quad }, "*");
};
</script>
<style>
  body {
    margin: 0;
    padding: 0;
    background: pink;
  }
  div {
    margin: 50px;
    width: 50px;
    height: 50px;
    background: green;
  }
</style>
<div id="inner-node"></div>