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chromium/third_party/blink/web_tests/external/wpt/css/css-variables/variable-empty-name-reserved.html 

<!doctype html>
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/2692">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1467309">
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:[email protected]">
<link rel="author" title="Mozilla" href="https://mozilla.org">
<title>-- is a reserved property name</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(function() {
  assert_false(CSS.supports("--", "initial"), "-- is a reserved property name");
});
</script>