favicon支援的圖片格式

為網站設定favicon有兩種方式：

1、網站根目錄下放置名為favicon.ico的圖片，瀏覽器就會自動擷取；

2、在頁面中通過<link rel="shortcut icon"  href="http://example.com/myicon.ico" />.

 

對於favicon來說，一般都是使用ico格式，不過對於根目錄的favicon圖片chrome、firefox、IE11等現代瀏覽器都支援PNG、GIF（無動畫）格式。對於通過link來設定的favicon格式，IE7+、現代瀏覽器都支援PNG、GIF格式，不過在IE7片效果會很差。

對於蘋果裝置，我們可以通過在head裡寫入<link rel="apple-touch-icon" href="somepath/image.png" />、<link rel="apple-touch-icon-precomposed" href="somepath/image.png" />來設定。

 

	Google Chrome	Internet Explorer	Firefox	Opera	Safari
<link rel="shortcut icon" href="http://example.com/myicon.ico" />	Yes[4]	Yes[4][19]	Yes[4]	Yes[4]	Yes
<link rel="icon" href="http://example.com/image.ico" />	Yes	Yes (from IE 11)[20]	Yes	Yes	Yes
<link rel="icon" type="image/vnd.microsoft.icon" href="http://example.com/image.ico" />	Yes	Yes (from IE 9)[20]	Yes	Yes	Yes
<link rel="icon" type="image/png" href="http://example.com/image.png" />	Yes	Yes (from IE 11)[20]	Yes	Yes	Yes
<link rel="icon" type="image/gif" href="http://example.com/image.gif" />	Yes	Yes (from IE 11)[20]	Yes	Yes	Yes
<link rel="icon" type="image/x-icon"href="http://example.com/image.ico"/>	Yes[4]	Yes (from IE 9)[26]	Yes[4]	Yes[4]	Yes
favicon.ico located in the website's root	Yes	Yes	Optional[27]	Optional[28]	Yes
precedence: prefer root or (X)HTML linked version	linked[22]	linked[22]	linked[22]	?	?

 

參考文檔：

http://en.wikipedia.org/wiki/Favicon

http://msdn.microsoft.com/en-us/library/ms537656(v=vs.85).aspx

http://stackoverflow.com/questions/1344122/favicon-png-vs-favicon-ico-why-should-i-use-pngs-instead-of-icos

http://www.webmasterworld.com/html/3701134.htm

http://blogs.msdn.com/b/ieinternals/archive/2013/09/08/internet-explorer-favicons-png-link-rel-icon-caching.aspx

http://blogs.msdn.com/b/jeffdav/archive/2007/03/01/why-doesn-t-the-favicon-for-my-site-appear-in-ie7.aspx