chromium/third_party/blink/web_tests/fast/css/empty-display-none.html

<style>
    div { width: 100px; height: 100px; }
    #target { margin-top: -100px; background-color: green; }
    #target:empty { display: none; }
</style>
<p>
    This tests that specifying <tt>display: none;</tt> for the <tt>:empty</tt>
    pseudoclass doesn&rsquo;t affect non-empty elements.
</p>
<div style="background-color: red;"></div>
<div id="target"><span></span></div>
<p id="result"></p>
<script>
    if (window.testRunner)
        testRunner.dumpAsText();

    document.getElementById("result").innerText = document.getElementById("target").offsetWidth === 100 ? "PASS" : "FAIL";
</script>