<!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}) { ${createStyleSheet(length - 1, i + 1)} } `.trim(); } // <div class=s0><div class=s1>...<span></span>...</div></div> function createElementChain(length, i) { if (length < 1) throw 'Invalid length'; if (i === undefined) i = 0; let e = document.createElement('div'); e.classList.add(`s${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>