最小可行的网站图标代码

我很困惑什么是让网站图标在大多数手机和浏览器上工作的最简单方法。

1) 一些网站 https://mathiasbynens.be/notes/touch-icons建议使用以下内容就足够了：

<link rel="apple-touch-icon-precomposed" href="apple-touch-icon-180x180.png">

这适用于 iOS 8，并且应该适用于 Android、BlackBerry、Windows 等。

2) 其他网站 http://realfavicongenerator.net坚持每一个可能的图标must明确指定：

<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) 这个答案 https://stackoverflow.com/questions/23849377/html-5-favicon-support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">

上述哪一项能够以最少的努力覆盖最多的浏览器/手机？

解决方案 3 中的代码是正确的，但已过时。iOS 7 中已弃用预组合触摸图标 https://developer.apple.com/library/ios/documentation/AppleApplications/Reference/SafariWebContent/ConfiguringWebApplications/ConfiguringWebApplications.html and Android Chrome 不再支持 196x196 图标，而是支持 192x192 https://developer.chrome.com/multidevice/android/installtohomescreen (它真的不会使用任何高于 192x192 的东西 http://realfavicongenerator.net/blog/android-chrome-and-its-favicon/;完全披露：我是本文的作者）。

So:

<!-- 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">

如果你可以放置favicon.ico在网站的根目录中，您甚至可以跳过其声明，因为 IE 会查找/favicon.ico按照惯例。