<!DOCTYPE html>
<html>
<head>
<style>
dialog {
    background: green;
    border-color: green;
}
div {
    content: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAAPAQMAAAABGAcJAAAAA1BMVEUAgACc+aWRAAAADElEQVR42mNgIAEAAAAtAAH7KhMqAAAAAElFTkSuQmCC);
}
</style>
</head>
<body>
<p>The test passes if you see a green square near the top of the viewport.
<div></div>
</body>
</html>
