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<html>
<head>
<style>
body {
background-color: Canvas;
}
</style>
<script>
function testColorScheme() {
if (window.matchMedia("(prefers-color-scheme: light)").matches) {
try {
window.webkit.messageHandlers.testHandler.postMessage("light-detected");
} catch(e) { }
}
if (window.matchMedia("(prefers-color-scheme: dark)").matches) {
try {
window.webkit.messageHandlers.testHandler.postMessage("dark-detected");
} catch(e) { }
}
}
</script>
</head>
<body onload="testColorScheme()">
</body>
</html>
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