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chromium/third_party/blink/web_tests/fast/css/variables/computed-style-detached-node-crash.html 

<!DOCTYPE html>
<p>PASS if no crash</p>
<script>
    if (window.testRunner)
        testRunner.dumpAsText();
    var elm = document.createElement("div");
    getComputedStyle(elm).getPropertyValue("--variable");
</script>