A favicon (short for "favorites icon"), also known as a page icon, is an icon associated with a particular website or webpage. A web designer can create such an icon, and many graphical web browsers—such as recent versions of Internet Explorer, Firefox, Mozilla, Opera, Safari, iCab, AOL Explorer, Epiphany, Konqueror, and Flock—can then make use of them. Browsers that support favicons may display them in the browser's URL bar, next to the site's name in lists of bookmarks, and next to the page's title in a tabbed document interface.
The original means of defining a favicon was by placing a file called favicon.ico in the root directory of a webserver. This would then automatically be used in Internet Explorer's favorites (bookmarks) display. Later, however, a more flexible system was created, using HTML to indicate the location of an icon for any given page. This is achieved by adding two link elements in the <head> section of the document as detailed below. In this way, any appropriately sized (16×16 pixels or larger) image can be used, and although many still use the .ico format, other browsers now also support the animated GIF and PNG image formats.
The "favicon.ico" facility is by no means essential to your website's operation. In fact, few people even notice its existence, and its really too small to put anything useful in it.
However, creating one can save your site some bandwidth if you have created a custom 404 File Not Found error file - that file will be sent by your web server everytime there is a request for a nonexistent "favicon.ico" file.
Perhaps more importantly, creating such an icon adds to the professionalism of your site, marking you as a web designer who attends to detail.
Wednesday, November 08, 2006
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