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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>