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<!doctype html>
<meta charset="utf-8">
<title>
Test for bug 1368240: We only invalidate style as little as needed
</title>
<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<style>
.foo .bar {
color: red;
}
#container ~ .bar {
color: green;
}
</style>
<div id="container">
<div></div>
<div></div>
<div></div>
</div>
<div></div>
<div></div>
<script>
SimpleTest.waitForExplicitFinish();
const utils = SpecialPowers.getDOMWindowUtils(window);
// TODO(emilio): Add an API to get the ComputedStyles we've recreated, to make
// more elaborated tests.
document.documentElement.offsetTop;
const initialRestyleGeneration = utils.restyleGeneration;
// Normally we'd restyle the whole subtree in this case, but we should go down
// the tree invalidating as little as needed (nothing in this case).
container.classList.add("foo");
document.documentElement.offsetTop;
is(utils.restyleGeneration, initialRestyleGeneration,
"Shouldn't have restyled any descendant");
container.setAttribute("id", "");
document.documentElement.offsetTop;
is(utils.restyleGeneration, initialRestyleGeneration,
"Shouldn't have restyled any sibling");
SimpleTest.finish();
</script>