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Test Info:

<!doctype html>
<title>Test for custom content inheritance</title>
<style>
html { color: red !important; }
</style>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script>
onload = function() {
try {
let doc = SpecialPowers.wrap(document);
let div = doc.createElement('div');
div.id = "test-id";
ok(!!doc.insertAnonymousContent,
"Must have the insertAnonymousContent API");
let content = doc.insertAnonymousContent(div);
ok(!!content, "Must have anon content");
isnot(content.getComputedStylePropertyValue("test-id", "color"),
getComputedStyle(document.documentElement).color,
"Custom anon content shouldn't inherit from the root element");
} catch(e) {
ok(false, "Threw: " + e);
}
SimpleTest.finish();
};
SimpleTest.waitForExplicitFinish();
</script>