我很担心在大多数手机和浏览器上使用favicons的最简单方法。
1）Some sites表明它足以使用：
<link rel="apple-touch-icon-precomposed" href="apple-touch-icon-180x180.png">
这适用于iOS 8，应该由Android，BlackBerry，Windows等提供。
2）Other sites坚持要明确指定每个可能的favicon ：
<link rel="apple-touch-icon" sizes="57x57" href="/apple-touch-icon-57x57.png">
<link rel="apple-touch-icon" sizes="114x114" href="/apple-touch-icon-114x114.png">
<link rel="apple-touch-icon" sizes="72x72" href="/apple-touch-icon-72x72.png">
<link rel="apple-touch-icon" sizes="144x144" href="/apple-touch-icon-144x144.png">
<link rel="apple-touch-icon" sizes="60x60" href="/apple-touch-icon-60x60.png">
<link rel="apple-touch-icon" sizes="120x120" href="/apple-touch-icon-120x120.png">
<link rel="apple-touch-icon" sizes="76x76" href="/apple-touch-icon-76x76.png">
<link rel="apple-touch-icon" sizes="152x152" href="/apple-touch-icon-152x152.png">
<link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon-180x180.png">
<link rel="icon" type="image/png" href="/favicon-192x192.png" sizes="192x192">
<link rel="icon" type="image/png" href="/favicon-160x160.png" sizes="160x160">
<link rel="icon" type="image/png" href="/favicon-96x96.png" sizes="96x96">
<link rel="icon" type="image/png" href="/favicon-16x16.png" sizes="16x16">
<link rel="icon" type="image/png" href="/favicon-32x32.png" sizes="32x32">
<meta name="msapplication-TileColor" content="#000000">
<meta name="msapplication-TileImage" content="/mstile-144x144.png">
3）This answer说你只需要：
<!-- For IE 9 and below. ICO should be 32x32 pixels in size -->
<!--[if IE]><link rel="shortcut icon" href="path/to/favicon.ico"><![endif]-->
<!-- Touch Icons - iOS and Android 2.1+ 180x180 pixels in size. -->
<link rel="apple-touch-icon-precomposed" href="apple-touch-icon-precomposed.png">
<!-- Firefox, Chrome, Safari, IE 11+ and Opera. 196x196 pixels in size. -->
<link rel="icon" href="path/to/favicon.png">
上述哪一项会以最少的努力覆盖大多数浏览器/手机？
答案 0 :(得分：14)
解决方案3中的代码是正确但过时的。 Precomposed Touch icons were deprecated in iOS 7和Android Chrome does not support 196x196 icons anymore, but 192x192（it really won't use anything above 192x192;完全披露：我是本文的作者。）
所以：
<!-- For IE 9 and below. ICO should be 32x32 pixels in size -->
<!--[if IE]><link rel="shortcut icon" href="/path/to/favicon.ico"><![endif]-->
<!-- Touch Icons - iOS and Android 2.1+ 180x180 pixels in size. -->
<link rel="apple-touch-icon" href="/path/to/apple-touch-icon.png">
<!-- Firefox, Chrome, Safari, IE 11+ and Opera. 192x192 pixels in size. -->
<link rel="icon" href="/path/to/favicon.png">
如果您可以将favicon.ico放在网站的根目录中，您甚至可以跳过其声明，因为IE按惯例查找/favicon.ico。