File: test_overflowing-body.html

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<!DOCTYPE HTML>
<html>
<!--
Test InspectorUtils.GetOverflowingChildrenOfElement applied to the body element
-->
<head>
<meta charset="utf-8">
<title>Test InspectorUtils.GetOverflowingChildrenOfElement on the body element</title>
<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
<style>
body {
  overflow: auto;
  margin: 0;
}
.tallBox {
  overflow: auto;
  background: lavender;
  width: 200px;
  height: 110vh;
}
</style>
<script>
'use strict';

SimpleTest.waitForExplicitFinish();
const InspectorUtils = SpecialPowers.InspectorUtils;

function runTests() {
  const body = document.documentElement;
  const overflowing_children = InspectorUtils.getOverflowingChildrenOfElement(body);

  is(overflowing_children.length, 1, `body has the expected number of children.`);

  SimpleTest.finish();
};
window.onload = runTests;
</script>
</head>
<body>
<div class="tallBox"><div>
</body>
</html>