IE 8: Icon "type" is not correct
IE 9-10: Icon not set
Android: Icon not set
iOS: Icons sizes "76x76, 120x120, 152x152, 180x180" not set
OSX: Icon not set
Windows 8: Tags is present
Windows 8.1: Tags is present
Desktop: Icons sizes "16x16, 32x32, 48x48" not set
Check if your site is using and correctly implementing a favicon. Favicons are small icons that appear in your browser's URL navigation bar.
They are also saved next to your URL's title when your page is bookmarked. This helps brand your site and make it easy for users to navigate to your site among a list of bookmarks.