FAVorites ICON - the site sign. It is shown by some browsers in an address bar before the page’s URL, and also as a bookmark icon, in tabs and in other interface elements. An image of size 16x16 pixels in format ICO is usually used. It is traditionally located in the site’s root under the name favicon.ico, because initially Internet Explorer searches it there. In HTML code, all the modern browsers understand an explicit instruction for positioning of an icon in such a format: The pass to the file, its format and the size of the image can be any allowed for WWW (except for Internet Explorer which allows ICO format only).