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Test Info: Warnings
- This test has a WPT meta file that expects 1 subtest issues.
- This WPT test may be referenced by the following Test IDs:
- /css/css-mixins/private/private-cssom-insert-rule.tentative.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<title>CSS @private: CSSOM insertRule</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(() => {
const sheet = new CSSStyleSheet();
sheet.replaceSync('.target {}');
const styleRule = sheet.cssRules[0];
const index = styleRule.insertRule(
'@private { --x: red; }', styleRule.cssRules.length);
assert_true(styleRule.cssRules[index] instanceof CSSPrivateRule);
assert_equals(styleRule.cssRules[index].cssText,
'@private { --x: red; }');
}, '@private can be inserted into a style rule');
test(() => {
const sheet = new CSSStyleSheet();
assert_throws_dom(
'SyntaxError',
() => sheet.insertRule('@private { --x: red; }'));
}, '@private cannot be inserted at the stylesheet top level');
for (const ruleText of [
'@media (width > 0px) {}',
'@supports (width: 1px) {}',
]) {
test(() => {
const sheet = new CSSStyleSheet();
sheet.replaceSync(ruleText);
const groupRule = sheet.cssRules[0];
assert_throws_dom(
'SyntaxError',
() => groupRule.insertRule('@private { --x: red; }'));
}, `@private cannot be inserted into a top-level ${
ruleText.split(' ')[0]} rule`);
}
</script>