为什么Base64嵌入字体不能在IE11中工作，如果“字体下载”财产被禁用？

问题描述

所以在面值上，这是有道理的 - 如果IE禁用字体下载，它不应该下载，罚款，我接受。 >然后 - 使用base64字体怎么样？这些都直接嵌入在CSS中/不要引用一个物理文件，因此不需要下载字体，对不对？

起初我以为也许IE11没有像/支持base64，但我可以验证它在那里工作，当我只使用base64字体选项。

我无法找到任何规格，或者在字体下载：禁用的广度上有很多信息。我看到一些类似的帖子，但没有答案，并没有问同样的问题。

任何人有更好的解释呢？

1. >

   安全性
   
   

   数据URL中的数据解释与给定媒体类型的任何实现具有相同的安全性
   注意事项。
   应用程序不应该解释
   数据URL的内容，该数据URL标记有一个媒体类型，该媒体类型已被
   禁止用于应用程序的配置。

来源：

So at face value, this makes sense -- if IE disables "font download," it shouldn't download, fine, I accept that.

HOWEVER -- what about using base64 fonts? These are embedded directly in CSS / do not reference a physical file, therefore no font should need to be downloaded, right?

At first I thought that maybe IE11 didn't like/support base64, but I can verify that it does work there when I use only a base64 font option.

I wasn't able to find any specs on this, or much info on the breadth of what "font download: disable" really means. I did see some similar posts but with no answers, and not asking the same question.

Anyone have a better explanation for this?

解决方案

Per a memo on the base64 spec:

1. Security

   Interpretation of the data within a "data" URL has the same securityconsiderations as any implementation of the given media type. Anapplication should not interpret the contents of a data URL which ismarked with a media type that has been disallowed for processing bythe application's configuration.

Sources: http://www.ietf.org/rfc/rfc2397.txthttp://sosweetcreative.com/2613/font-face-and-base64-data-uri

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