<!DOCTYPE html>
<html>
<head>
<style>
.parent {
    position: relative;
    padding: 10px;
    background-color: silver;
}

.child {
    position: absolute;
    width: 200px;
    height: 200px;
    top: 0px;
    background-color: green;
    display: none;
}

.enableHover:hover .child {
    display: block;
}

</style>
<script>
if (window.testRunner)
    testRunner.waitUntilDone();

function runTest(targetSelector) {
    var target = document.querySelector(targetSelector);

    if (window.eventSender) {
        var x = target.offsetLeft + target.offsetWidth / 2;
        var y = target.offsetTop + target.offsetHeight / 2;
        eventSender.mouseMoveTo(x, y);
    }
}

async function runTests() {
    await new Promise(requestAnimationFrame);
    runTest("#target");
    await new Promise(requestAnimationFrame);
    runTest("#target2");
    await new Promise(requestAnimationFrame);
    if (window.testRunner)
        testRunner.notifyDone();
}

</script>
</head>
<body onload="runTests()">
<div>
Test that clearing dynamically activated :hover rule affecting descendants works.
</div>
<div id="target" class="parent enableHover">
    Hover to see a green box below.
    <div class="child"></div>
</div>
<div id="target2" class="parent enableHover">
    Hover to see a green box below.
    <div class="child"></div>
</div>
</body>
</html>