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<!doctype html>
<title>@starting-style: parsing</title>
<link rel="help" href="https://drafts.csswg.org/css-transitions-2/#at-ruledef-starting-style">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<main id=main></main>
<script>
function test_valid(actual, expected) {
if (expected === undefined)
expected = actual;
test(t => {
t.add_cleanup(() => main.replaceChildren());
let style = document.createElement('style');
style.textContent = `${actual}{}`;
main.append(style);
assert_equals(style.sheet.rules.length, 1);
let rule = style.sheet.rules[0];
assert_equals(rule.cssText, `${expected} {\n}`);
}, `${actual} is valid`);
}
function test_invalid(actual) {
test(t => {
t.add_cleanup(() => main.replaceChildren());
let style = document.createElement('style');
style.textContent = `${actual}{}`;
main.append(style);
assert_equals(style.sheet.rules.length, 0);
}, `${actual} is not valid`);
}
test_valid('@starting-style');
test_invalid('@starting-style div');
test_invalid('@starting-style ()');
test_invalid('@starting-style ( {}');
test_invalid('@starting-style }');
</script>
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