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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1740702">
<link rel="match" href="../reference/ref-filled-green-100px-square-only.html">
<style>
#grid {
display: grid;
width: 100px;
height: 100px;
background: red;
}
#initiallyHidden {
display: none;
width: 100px;
height: 100px;
background: green;
}
</style>
</head>
<body>
<p>Test passes if there is a filled green square.</p>
<div id="grid">
<div>
<div>
<div>
<div id="initiallyHidden">
</div>
</div>
</div>
</div>
</div>
<script>
"use strict";
const grid = document.getElementById("grid");
const initiallyHidden = document.getElementById("initiallyHidden");
document.documentElement.offsetHeight; // Flush layout
// Fails in buggy Firefox build because it prevents reflows from happening
getComputedStyle(grid).getPropertyValue("grid-template-columns");
document.documentElement.offsetHeight; // Flush layout again
initiallyHidden.style.display = "block"; // This should trigger a reflow.
</script>
</body>
</html>
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