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Test Info:

<!doctype html>
<meta charset="utf-8">
<title>CSS Test: initial computed value of content for elements is not none</title>
<link rel="author" href="https://mozilla.org" title="Mozilla">
<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(function() {
assert_equals(getComputedStyle(document.documentElement, "::before").content, "none");
assert_not_equals(getComputedStyle(document.documentElement).content, "none");
}, "initial computed value of content for elements is not none");
</script>