LayoutTests/fast/layers/inline-dirty-z-order-lists.html

<p>
    Test for <i><a href="https://bugs.webkit.org/show_bug.cgi?id=23848">https://bugs.webkit.org/show_bug.cgi?id=23848</a> REGRESSION: Crash when mouse cursor moves over a link on www.opportuno.de</i>.
</p>
<p>
    This tests that changing the z-index of an inline correctly invalidates its
    layer&rsquo;s and its stacking context&rsquo;s z-index lists.
</p>
<span id="outer" style="position: relative; z-index: 100;">
    <div id="inner" style="position: absolute; height: 50px; width: 50px; background-color: blue;">
    </div>
</span>
<script>
    function test()
    {
        document.getElementById("outer").style.removeProperty("z-index");
        document.getElementById("inner").style.display = "none";
    }

    onload = async () => {
        if (window.testRunner) {
            document.body.offsetTop;
            testRunner.waitUntilDone();
            await testRunner.displayAndTrackRepaints();
            test();
            testRunner.notifyDone();
        } else
            setTimeout(test, 0);
    }
</script>