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<!DOCTYPE html>
<title>CSS Nesting: Style invalidates after CSSOM mutations to nested rules</title>
<link rel="help" href="https://drafts.csswg.org/css-nesting-1/#nested-style-rule">
<link rel="help" href="https://drafts.csswg.org/css-nesting-1/#nested-group-rules">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style id=set_parent_selector_text_style>
.set_parent_selector_text {
div {
color: red;
}
.a1 {
color: green;
}
}
</style>
<div class=set_parent_selector_text>
<div class=a1>A1</div>
<div class=a2>A2</div>
</div>
<script>
test(() => {
let a1 = document.querySelector('.set_parent_selector_text > .a1');
let a2 = document.querySelector('.set_parent_selector_text > .a2');
assert_equals(getComputedStyle(a1).color, 'rgb(0, 128, 0)');
assert_equals(getComputedStyle(a2).color, 'rgb(255, 0, 0)');
let rules = set_parent_selector_text_style.sheet.cssRules;
assert_equals(rules.length, 1);
assert_equals(rules[0].cssRules.length, 2);
let a_rule = rules[0].cssRules[1];
assert_equals(a_rule.selectorText, '& .a1');
a_rule.selectorText = '.a2';
assert_equals(getComputedStyle(a1).color, 'rgb(255, 0, 0)');
assert_equals(getComputedStyle(a2).color, 'rgb(0, 128, 0)');
}, 'Nested rule responds to parent selector text change');
</script>
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