Safari Top Sites Preview

Question

In the Top Sites section of Safari, the iCloud.com image shows the logo instead of the login screen as you can see below. Normally, the Top Sites just shows a picture of the loa

Answer 1

Here's how it's done on iCloud to show a Top Sites specific preview: (edited for formatting)

if (window.navigator && window.navigator.loadPurpose === "preview") {
    window.location.href = "http://www.icloud.com/topsites_preview/";
};

Source: http://blog.raffael.me/post/18565169038/defining-how-your-website-looks-like-in-safari-topsites