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^ Safari, since version 12.0, supports single-color SVG favicons in some cases in a non-standard mask-icon format.

This table illustrates the different areas of the browser where favicons can be displayed. The ICO file format article explains the details for icons with more than 256 colors on various Microsoft Windows platforms. The following table illustrates the image file format support for the favicon.Īdditionally, such icon files can be 16×16, 32×32, 48×48, or 64×64 pixels in size, and 8-bit, 24-bit, or 32-bit in color depth. Unless noted, the version numbers indicate the starting version number of a supported feature. The following tables illustrate support of various features with major web browsers. Netscape 7 and Internet Explorer versions 5 and 6 display the favicon only when the page is bookmarked, and not simply when the pages are visited as in later browsers. Internet Explorer 5–10 supports only the ICO file format. In 2011 the HTML living standard specified that for historical reasons shortcut is allowed immediately before icon however, shortcut does not have a meaning in this context. The popular theoretically identifies two relations, shortcut and icon, but shortcut is not registered and is redundant.

RFC 5988 established an IANA link relation registry, Īnd rel="icon" was registered in 2010 based on the HTML5 specification.

ico with the non-standard image/x-icon MIME type in Web servers. A workaround for Internet Explorer is to associate. not as favicon), Internet Explorer cannot display files served with this standardized MIME type. ico format was registered by a third party with the Internet Assigned Numbers Authority (IANA) under the MIME type image/.

Unlike in the prior scheme, the file can be in any Website directory and have any image file format. The standard implementation uses a link element with a rel attribute in the section of the document to specify the file format, file name, and location. The favicon was standardized by the World Wide Web Consortium (W3C) in the HTML 4.01 recommendation, released in December 1999, and later in the XHTML 1.0 recommendation, released in January 2000. 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. 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.

3.5 Home screen icons on mobile devices.

3.4 HTML5 recommendation for icons in multiple sizes.