什么是“a”字体：0/0 a; [英] What does "a" stand for in font: 0/0 a;

问题描述

我是一个视频教程，设计师使用 font：0/0 a; 替换图片，所以我得到 0 是 font-size ，另一个 0 是 但设计师跳过 a 部分只是说这是一个黑客。

I was referring a video tutorial where the designer used font: 0/0 a; for image replacement, so I get that 0 is the font-size, another 0 is the line-height but designer skips the a part just by saying that's an hack.

推荐答案

http://nicolasgallagher.com/another-css-image-replacement-technique/

font：0/0 a - 一个缩写字体大小的缩写属性和
line-height。 a值用作非常短的字体族（从该方法的BEM实现获取的概念
）。 CSS验证器
抱怨在速记字体属性中使用0/0无效，但是每个浏览器都接受它，这似乎是
验证器中的错误。使用font：0px / 0 a通过验证，但它在验证器标记为有效的代码中显示为
font：0/0 a。

font:0/0 a – a shorthand property that zeros out the font size and line-height. The a value acts as a very short font-family (an idea taken from the BEM implementation of this method). The CSS validator complains that using 0/0 in the shorthand font property is not valid, but every browser accepts it and this appears to be an error in the validator. Using font:0px/0 a passes validation but it displayed as font:0/0 a in the code that the validator flags as valid.

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