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Test Info:

<!DOCTYPE html>
<meta charset="utf-8">
<title>user-modify should be unsupported in author origin</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#modified {
user-modify: read-write;
}
</style>
<div id="inherited"></div>
<div id="modified"></div>
<script>
test(function() {
for (const el of [inherited, modified]) {
assert_equals(el.style.userModify, undefined);
assert_equals(el.style.UserModify, undefined);
assert_equals(getComputedStyle(el).getPropertyValue('user-modify'), '');
}
}, 'user-modify is not supported');
</script>