LayoutTests/fast/selectors/has-scope-breaking-classification.html

<pre id=log></pre>
<script>
if (window.testRunner)
    testRunner.dumpAsText();

function testScopeBreaking(selector) {
    if (!window.internals)
        return;
    const style = document.createElement("style");
    style.textContent = selector + " { color:green }";
    document.head.appendChild(style);
    const isScopeBreaking = internals.hasScopeBreakingHasSelectors;
    log.textContent += selector + (isScopeBreaking ? " IS scope breaking\n" : " is not scope breaking\n");
    style.remove();
}

testScopeBreaking(":has(foo)");
testScopeBreaking(":has(foo bar)");
testScopeBreaking(":has(foo ~ bar)");
testScopeBreaking(":has(~ foo)");
testScopeBreaking(":has(~ foo bar)");
testScopeBreaking(":has(+ foo)");
testScopeBreaking(":has(+ foo bar)");
testScopeBreaking(":has(:is(foo))");
testScopeBreaking(":has(:is(foo bar))");
testScopeBreaking(":has(:is(foo ~ bar))");
testScopeBreaking(":is(:has(foo))");
testScopeBreaking(":is(:has(foo bar))");
testScopeBreaking(":is(:has(:is(foo)))");
testScopeBreaking(":is(:has(:is(foo bar)))");
testScopeBreaking(":has(~ foo)");
testScopeBreaking(":has(~ foo bar)");
testScopeBreaking(":has(~ :is(foo))");
testScopeBreaking(":has(~ :is(foo bar))");
testScopeBreaking(":is(~ :has(foo))");
testScopeBreaking(":is(:has(~ foo bar))");
testScopeBreaking(":is(:has(~ :is(foo)))");
testScopeBreaking(":is(:has(~ :is(foo bar)))");
testScopeBreaking(":has(+ foo)");
testScopeBreaking(":has(+ foo bar)");
testScopeBreaking(":has(+ :is(foo))");
testScopeBreaking(":has(+ :is(foo bar))");
testScopeBreaking(":is(+ :has(foo))");
testScopeBreaking(":is(:has(+ foo bar))");
testScopeBreaking(":is(:has(+ :is(foo)))");
testScopeBreaking(":is(:has(+ :is(foo bar)))");
testScopeBreaking(":has(:not(foo))");
testScopeBreaking(":has(:not(foo bar))");
testScopeBreaking(":has(:not(foo ~ bar))");
testScopeBreaking(":not(:has(foo))");
testScopeBreaking(":not(:has(foo bar))");
testScopeBreaking(":not(:has(:not(foo)))");
testScopeBreaking(":not(:has(:not(foo bar)))");
testScopeBreaking(":has(~ foo)");
testScopeBreaking(":has(~ foo bar)");
testScopeBreaking(":has(~ :not(foo))");
testScopeBreaking(":has(~ :not(foo bar))");
testScopeBreaking(":not(~ :has(foo))");
testScopeBreaking(":has(+ foo)");
testScopeBreaking(":has(+ foo bar)");
testScopeBreaking(":has(+ :not(foo))");
testScopeBreaking(":has(+ :not(foo bar))");
testScopeBreaking(":not(+ :has(foo))");
testScopeBreaking(":not(:has(~ foo bar))");
testScopeBreaking(":not(:has(~ :not(foo)))");
testScopeBreaking(":not(:has(~ :not(foo bar)))");
testScopeBreaking(":not(:has(+ foo bar))");
testScopeBreaking(":not(:has(+ :not(foo)))");
testScopeBreaking(":not(:has(+ :not(foo bar)))");
testScopeBreaking(":has(> :is(.x > .y))");
testScopeBreaking(":has(> :is(.x .y))");
testScopeBreaking(":has(:is(.x > .y))");
testScopeBreaking("ol:has(> :is(.count-and-index-99-children > li:nth-child(10n+1)))");
</script>