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<!DOCTYPE html>
<title>CSSOM: Modify selectorText in a shadow tree stylesheet</title>
<link rel="author" title="Rune Lillesveen" href="mailto:futhark@chromium.org">
<link rel="help" href="https://drafts.csswg.org/cssom/#dom-cssstylerule-selectortext">
<link rel="help" href="https://drafts.csswg.org/css-scoping/#selectors">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#container { color: red }
.subtree * { color: pink }
</style>
<div id="container">
<div id="host"></div>
</div>
<script>
const root = host.attachShadow({mode:"open"});
root.innerHTML = "<style>nomatch { color: green }</style><div>Green</div>";
const div = root.querySelector("div");
test(() => {
assert_equals(getComputedStyle(div).color, "rgb(255, 0, 0)", "Color should initial be red.");
}, "Check initial color.");
test(() => {
// The combination of the .subtree and CSSOM selector style invalidations
// caused the Blink implementation to fail an assertion.
container.className = "subtree";
root.styleSheets[0].cssRules[0].selectorText = "div";
assert_equals(getComputedStyle(div).color, "rgb(0, 128, 0)", "Color should be green after stylesheet change.");
}, "Check that color changes correctly after shadow stylesheet selector and #container class is changed.");
</script>
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