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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;
}
.cellOriginal {
grid-column-end: span 2;
}
.cellChanged {
grid-column-end: span 5;
}
</style>
<script>
"use strict";
SimpleTest.waitForExplicitFinish();
function runTests() {
const grid = document.getElementById("grid");
const cell = document.getElementById("cell");
const gridA = grid.getGridFragments()[0];
// Check that grid fragments are equal across reflows.
document.documentElement.offsetHeight; // Flush layout.
const gridB = grid.getGridFragments()[0];
is(gridB, gridA, "Grid fragments should be the same across reflows.");
// Check that grid fragments are different when styles are different.
cell.classList.replace("cellOriginal", "cellChanged");
const gridC = grid.getGridFragments()[0];
isnot(gridC, gridA, "Grids with different styles should have different fragments.");
// Check that changing a grid to a matching style results in different fragments.
cell.classList.replace("cellChanged", "cellOriginal");
const gridD = grid.getGridFragments()[0];
isnot(gridD, gridA, "Grids changed to the same styles should have different fragments.");
SimpleTest.finish();
}
</script>
</head>
<body onLoad="runTests();">
<div id="grid">
<div id="cell" class="cellOriginal"></div>
</div>
</body>
</html>
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