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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
| commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
| tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /layout/style/test/test_computed_style_no_flush.html | |
| parent | Initial commit. (diff) | |
| download | firefox-esr-upstream.tar.xz firefox-esr-upstream.zip | |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'layout/style/test/test_computed_style_no_flush.html')
| -rw-r--r-- | layout/style/test/test_computed_style_no_flush.html | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/layout/style/test/test_computed_style_no_flush.html b/layout/style/test/test_computed_style_no_flush.html new file mode 100644 index 0000000000..2caea9d294 --- /dev/null +++ b/layout/style/test/test_computed_style_no_flush.html @@ -0,0 +1,63 @@ +<!doctype html> +<meta charset="utf-8"> +<title> + Test for bug 1363805: We only restyle as little as needed +</title> +<link rel="author" href="mailto:wpan@mozilla.com" title="Wei-Cheng Pan"> +<script src="/tests/SimpleTest/SimpleTest.js"></script> +<style> +.black { + background-color: black; +} +.black + div { + background-color: gray; +} +</style> +<div id="container"> + <div> + <div id="foo"> + </div> + <div id="bar"> + </div> + </div> +</div> +<script> +function flushStyle () { + getComputedStyle(document.body).width; +} + +SimpleTest.waitForExplicitFinish(); +const utils = SpecialPowers.getDOMWindowUtils(window); +const container = document.querySelector('#container'); +const foo = document.querySelector('#foo'); +const bar = document.querySelector('#bar'); + +flushStyle(); +let currentRestyleGeneration = utils.restyleGeneration; + +// No style changed, so we should not restyle. +getComputedStyle(foo).backgroundColor; +is(utils.restyleGeneration, currentRestyleGeneration, + "Shouldn't restyle anything if no style changed"); + +// foo's parent has changed, must restyle. +container.classList.toggle('black'); +getComputedStyle(foo).backgroundColor; +isnot(utils.restyleGeneration, currentRestyleGeneration, + "Should have restyled something"); + +currentRestyleGeneration = utils.restyleGeneration; + +// The change of foo should not affect its parent. +foo.classList.toggle('black'); +getComputedStyle(container).backgroundColor; +is(utils.restyleGeneration, currentRestyleGeneration, + "Shouldn't restyle anything if no style changed"); + +// It should restyle for foo's later sibling. +getComputedStyle(bar).backgroundColor; +isnot(utils.restyleGeneration, currentRestyleGeneration, + "Should have restyled something"); + +SimpleTest.finish(); +</script> |