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

button:disabled {
    color: red;
}

.trigger-style-recalc {
    /* No change, we just need a new style recalculation. */
    font-weight:bold;
}
</style>
</head>
<body style="color: green">
<button>The test passes if this is in green.</button>
<dialog></dialog>
<script>
"use strict";
test(function() {
    document.querySelector('dialog').showModal();
    var button = document.querySelector('button');
    button.classList.add('trigger-style-recalc');
    var color = document.defaultView.getComputedStyle(button).getPropertyValue('color');
    assert_equals(color, 'rgb(0, 128, 0)');
}, "Tests inert elements do not match the :disabled selector.");
</script>
</body>
</html>