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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Selector Invalidation: :has() invalidation should not be O(n^2)</title>
<link rel="author" title="Antti Koivisto" href="mailto:antti@apple.com">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="help" href="https://drafts.csswg.org/selectors/#relational">
<style>
div, main { color: grey }
main:has(span) .subject { color: red }
main:has(span + span) .subject { color: green }
main:has(span + final) .subject { color: blue }
main:has(nonexistent + span) .subject { color: black }
main:has(span) span { color: black }
main:has(nonexistent) span { color: black }
main:has(div div span) .subject { color: purple }
</style>
<main>
<div id=container>
<span></span>
</div>
<div id=subject class=subject></div>
</main>
<script>
const grey = 'rgb(128, 128, 128)';
const red = 'rgb(255, 0, 0)';
const green = 'rgb(0, 128, 0)';
const blue = 'rgb(0, 0, 255)';
const purple = 'rgb(128, 0, 128)';
function testColor(test_name, color) {
test(function() {
assert_equals(getComputedStyle(subject).color, color);
}, test_name);
}
const count = 25000;
testColor(`Before appending ${count} elements`, red);
for (let i = 0; i < count; ++i) {
const span = document.createElement("span");
container.appendChild(span);
}
testColor(`After appending ${count} elements. This should not time out.`, green);
for (let i = 0; i < count - 1; ++i) {
const span = document.createElement("span");
container.appendChild(span);
}
const final = document.createElement("final");
container.appendChild(final);
testColor(`After appending another ${count} elements. This should not time out.`, blue);
const div = document.createElement("div");
for (let i = 0; i < count; ++i) {
const span = document.createElement("span");
div.appendChild(span);
}
container.appendChild(div);
testColor(`After appending div with ${count} elements. This should not time out.`, purple);
div.remove();
testColor(`After removing div with ${count} elements. This should not time out.`, blue);
for (let i = 0; i < count; ++i)
container.lastChild.remove();
testColor(`After removing ${count} elements one-by-one. This should not time out.`, green);
container.replaceChildren();
testColor(`After removing the remaining elements. This should not time out.`, grey);
</script>
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