

A side effect was that the number of visitors who had bookmarked the page could be estimated by the requests of the favicon.

It was used in Internet Explorer's favorites (bookmarks) and next to the URL in the address bar if the page was bookmarked. Originally, the favicon was a file called favicon.ico placed in the root directory of a website.

In March 1999, Microsoft released Internet Explorer 5, which supported favicons for the first time. 2.5 Home screen icons on mobile devices.2.4 HTML5 recommendation for icons in multiple sizes.
