<!DOCTYPE html>
<html>
<head>
<script src="../../../resources/testharness.js"></script>
<script src="../../../resources/testharnessreport.js"></script>
<style>
button {
    color: green;
}

button:disabled {
    color: red;
}

</style>
</head>
<body style="color: green">
<button inert>The test passes if this is in green.</button>
<script>
test(function() {
    button = document.querySelector('button');
    color = document.defaultView.getComputedStyle(button).getPropertyValue('color');
    assert_equals(color, 'rgb(0, 128, 0)');
}, 'Tests that inert elements do not match the :disabled selector.');
</script>
</body>
</html>