为favicon.ico添加链接标签是必要的吗？ [英] Necessary to add link tag for favicon.ico?

问题描述

是否有任何现代浏览器不会自动检测到favicon.ico？是否有理由为favicon.ico添加链接标记？

Are there any modern browsers that won't detect the favicon.ico automatically? Is there any reason to add the link tag for favicon.ico?

<link rel="shortcut icon" href="/favicon.ico">

我的猜测是，如果您决定使用GIF，只需将它包含在HTML文档中或PNG ...

My guess is that it's only necessary to include it in the HTML document if you decide to go with GIF or PNG...

推荐答案

选择不同的位置或文件类型（例如 PNG 或 SVG ）的favicon：

一个原因可能是你想要在特定位置的图标，也许在图像文件夹或类似的东西。例如：

To choose a different location or file type (e.g. PNG or SVG) for the favicon:
One reason can be that you want to have the icon in a specific location, perhaps in the images folder or something alike. For example:

<link rel="icon" href="_/img/favicon.png">

这个不同的位置甚至可能是一个CDN，就像SO似乎对< link rel =shortcut iconhref =http://cdn.sstatic.net/stackoverflow/img/favicon.ico> 。

This diferent location may even be a CDN, just like SO seems to do with <link rel="shortcut icon" href="http://cdn.sstatic.net/stackoverflow/img/favicon.ico">.

要详细了解如何使用PNG等其他文件类型，请查看此问题。

To learn more about using other file types like PNG check out this question.

用于缓存清除用途：

将查询字符串添加到缓存清除目的的路径中： / p>

For cache busting purposes:
Add a query string to the path for cache-busting purposes:

<link rel="icon" href="/favicon.ico?v=1.1"> 

Favicons的缓存非常多，这是一种确保刷新的好方法。

Favicons are very heavily cached and this a great way to ensure a refresh.

关于默认位置的脚注：

至于问题的第一位：全部现代浏览器会在默认位置检测到图标，因此 不是使用链接的理由。

脚注 rel =icon：

如 @ Semanino的回答所示，使用 rel =快捷图标 code>是老版本的Internet Explorer所需的旧技术，但在大多数情况下可以用更正确的 rel =icon指令替换。 基于此的文章@Semanino 正确链接到相应的规范，其中显示 rel 的值快捷键不是有效的选项。

Footnote about rel="icon":
As indicated by @Semanino's answer, using rel="shortcut icon" is an old technique which was required by older versions of Internet Explorer, but in most cases can be replaced by the more correct rel="icon" instruction. The article @Semanino based this on properly links to the appropriate spec which shows a rel value of shortcut isn't a valid option.

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