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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" href="chrome://mochikit/content/tests/SimpleTest/test.css" />
<style>
#grid {
display: grid;
width: 100px;
height: 100px;
}
#initiallyHidden {
display: none;
width: 100px;
height: 100px;
background: lime;
}
</style>
<script>
"use strict";
SimpleTest.waitForExplicitFinish();
function runTests() {
const grid = document.getElementById("grid");
const initiallyHidden = document.getElementById("initiallyHidden");
document.documentElement.offsetHeight; // Flush layout to be sure we have grid-item sizes cached
grid.getGridFragments(); // This marks the grid and its descendants as dirty
document.documentElement.offsetHeight; // Flush layout again. In buggy builds, this layout will fail to reflow/clear-dirty-bits on the grid item.
initiallyHidden.style.display = "block"; // This should trigger a reflow.
let height = getComputedStyle(initiallyHidden).height;
is(height, "100px", "initiallyHidden element should get a reflow and arrive at the expected height after we toggle its display");
SimpleTest.finish();
}
</script>
</head>
<body onLoad="runTests();">
<div id="grid">
<div>
<div>
<div>
<div id="initiallyHidden">
PASS
</div>
</div>
</div>
</div>
</div>
</body>
</html>
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