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Diffstat (limited to 'dom/grid/test/chrome/test_grid_subtree_dirty.html')
| -rw-r--r-- | dom/grid/test/chrome/test_grid_subtree_dirty.html | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/dom/grid/test/chrome/test_grid_subtree_dirty.html b/dom/grid/test/chrome/test_grid_subtree_dirty.html new file mode 100644 index 0000000000..4baa94872e --- /dev/null +++ b/dom/grid/test/chrome/test_grid_subtree_dirty.html @@ -0,0 +1,56 @@ +<!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> |