<html>
<head>
<title>CSS4 media query test: monochrome.</title>
<style type="text/css">
p { color: black; }
</style>
<script>
window.addEventListener("load", function () {
    if (!window.internals)
        return;

    window.internals.settings.forcedDisplayIsMonochromeAccessibilityValue = "on";
    if (window.matchMedia("(monochrome)").matches)
        document.getElementById("a").style.color = "#888";

    window.internals.settings.forcedDisplayIsMonochromeAccessibilityValue = "off";
    if (!window.matchMedia("(monochrome)").matches)
        document.getElementById("b").style.color = "#888";
}, false);
</script>
</head>
<body>
  <p id="a">This text should be mid grey #888.</p>
  <p id="b">This text should be mid grey #888.</p>
</body>
</html>