<!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;
}

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

/* :matches() is here to disable the selector compiler */
#target2:matches(:root, :nth-of-type(n), :not(#specificity-trick), :nth-last-of-type(n)).enableHover:hover .child {
    display: block;
}

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

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

    target.classList.add('enableHover');

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

    return child.offsetWidth != 0;
}

function log(text, pass) {
    var log = document.querySelector("#log");
    var line = document.createElement("div");
    line.innerHTML = text + ": " + (pass ? "PASS" : "FAIL");
    log.appendChild(line);
}

function runTests() {
    var compilerPass = runTest("#target");
    var checkerPass = runTest("#target2");
    if (!window.testRunner)
        return;
    log("Selector compiler", compilerPass);
    log("Selector checker", checkerPass);

    testRunner.notifyDone();
}

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