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<!DOCTYPE html>
<title>@scope - deeply nested</title>
<link rel="help" href="https://drafts.csswg.org/css-cascade-6/#scope-atrule">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
main * { background-color: black; }
</style>
<main id=main></main>
<script>
// @scope (.s0) { @scope (.s1) { ... span {} ... } }
function createStyleSheet(length, i) {
if (length == 0)
return 'span { background-color: green; }';
if (i === undefined)
i = 0;
return `
@scope (.s${i}) {
${createStyleSheet(length - 1, i + 1)}
}
`.trim();
}
// <div class=s0><div class=s1>...<span/>...</div></div>
function createElementChain(length, i) {
if (length < 1)
throw 'Invalid length';
if (i === undefined)
i = 0;
let e = document.createElement('div');
e.classList.add(`s${i}`);
if (length > 1)
e.append(createElementChain(length - 1, i + 1));
else
e.append(document.createElement('span'));
return e;
}
const COUNT = 90;
let style_node = document.createElement('style');
style_node.textContent = createStyleSheet(COUNT);
main.append(style_node);
main.append(createElementChain(COUNT));
test(() => {
for (let span of main.querySelectorAll('span'))
assert_equals(getComputedStyle(span).backgroundColor, 'rgb(0, 128, 0)');
}, 'Deep @scope nesting');
</script>
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