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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Test: CSSOM StyleSheet insertRule across context</title>
<link rel="author" title="Kagami Sascha Rosylight" href="mailto:saschanaz@outlook.com">
<link rel="author" title="Mozilla" href="https://mozilla.org">
<link rel="help" href="https://drafts.csswg.org/cssom/">
<script src="/resources/testharness.js" type="text/javascript"></script>
<script src="/resources/testharnessreport.js" type="text/javascript"></script>
<iframe id="iframe"></iframe>
<script>
function createSheet() {
const tempStyleElement = iframe.contentDocument.createElement('style');
iframe.contentDocument.head.append(tempStyleElement);
const tempStyle = tempStyleElement.sheet;
tempStyleElement.remove();
return tempStyle;
}
test(() => {
const sheet = createSheet();
sheet.insertRule(".kaoru {}");
assert_equals(sheet.rules[0].constructor, iframe.contentWindow.CSSStyleRule);
}, "The constructor of inserted rule object must be from iframe");
test(() => {
const sheet = new iframe.contentWindow.CSSStyleSheet();
sheet.insertRule(".kaoru {}");
assert_equals(sheet.rules[0].constructor, iframe.contentWindow.CSSStyleRule);
}, "The constructor of inserted rule object must be from iframe for new CSSStyleSheet()");
</script>
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