Indeed, Chrome for Mac will ignore the 16×16 favicon and use the 32×32 version, only to scale it back down to 16×16 on non-retina devices.Opera will choose from any of the available icons completely at random.Multiple icon formats, including container formats such as Microsoft and Macintosh files, as well as Scalable Vector Graphics may be provided by including the icon's content type in the format method detailed above.The Google Chrome web browser however, will select the closest matching size from those provided in the HTML headers to create 128×128 pixel application icons, when the user chooses the Create application shortcuts... Various browsers such as Chrome, Firefox and Opera support animation of favicons.Chrome for Windows will use the favicon that comes first if it is 16×16, otherwise the ICO.If none of the aforementioned options are available, both Chromes will use whichever favicon comes first, exactly the opposite of Firefox and Safari.
It was used in Internet Explorer's favorites (bookmarks) and next to the URL in the address bar if the page was bookmarked.
This table illustrates the different areas of the browser where favicons can be displayed.
If links for both PNG and ICO favicons are present, PNG-favicon-compatible browsers select which format and size to use as follows.
A side effect was that the number of visitors who had bookmarked the page could be estimated by the requests of the favicon.
This side effect no longer works, as all modern browsers load the favicon file to display in their web address bar, regardless of whether the site is bookmarked." does not have a meaning in this context.