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chromium/third_party/blink/web_tests/external/wpt/css/mediaqueries/mq-invalid-media-type-005.html 

<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>Mediaqueries-3 test: parsing hanging-punctuation with invalid values</title>
<link rel="help" href="https://www.w3.org/TR/css3-mediaqueries/#error-handling">
<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net/">
<meta name="flags" content="invalid">
<meta name="assert" content="media types ''not'', ''and'', ''only'' and ''or'' must not be treated as unknown media types, but rather trigger the malformed query clause.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
    @media not and {
        div { background-color: red; }
    }
    @media and {
        div { background-color: red; }
    }
    @media not or {
        div { background-color: red; }
    }
    @media or {
        div { background-color: red; }
    }
    @media not not {
        div { background-color: red; }
    }
    @media not {
        div { background-color: red; }
    }
    @media not only {
        div { background-color: red; }
    }
    @media only {
        div { background-color: red; }
    }
</style>
<script>
var queries = document.styleSheets[0].cssRules;
test(() => {
        for (const query of queries) {
                assert_equals(query.conditionText, "not all");
        }
        assert_equals(queries.length, 8, "invalid rules must be treated as 'not all', not dropped");
    }, "syntactical MQ keywords used as media types are a syntax error");
</script>