css - css编码，我从来没有见过 [英] css - css coding that I have never seen
问题描述
我正在研究一个名为zerofour的免费css模板，位于 http://html5up.net/zerofour/ ， css编码，我从来没有见过。在HTML中，一些div有类4u，但是当我检查css文件时，这是唯一有这些术语的文本段，它看起来像这样：
I am studying a free css template called zerofour found at http://html5up.net/zerofour/, and running across a css coding that I have never seen before. In the HTML, some divs have class such as "4u", but when I check the css files, this is the only text section that has anything with those terms, and it looks like this:
/* Grid */
/* Cells */
.\31 2u { width: 100% }
.\31 1u { width: 91.6666666667% }
.\31 0u { width: 83.3333333333% }
.\39 u { width: 75% }
.\38 u { width: 66.6666666667% }
.\37 u { width: 58.3333333333% }
.\36 u { width: 50% }
.\35 u { width: 41.6666666667% }
.\34 u { width: 33.3333333333% }
.\33 u { width: 25% }
.\32 u { width: 16.6666666667% }
.\31 u { width: 8.3333333333% }
.\-11u { margin-left: 91.6666666667% }
.\-10u { margin-left: 83.3333333333% }
.\-9u { margin-left: 75% }
.\-8u { margin-left: 66.6666666667% }
.\-7u { margin-left: 58.3333333333% }
.\-6u { margin-left: 50% }
.\-5u { margin-left: 41.6666666667% }
.\-4u { margin-left: 33.3333333333% }
.\-3u { margin-left: 25% }
.\-2u { margin-left: 16.6666666667% }
.\-1u { margin-left: 8.3333333333% }
$ b $ p
当我使用chrome开发者删除4u类时，页面受到影响。但是，当我从css文件中删除此部分时，什么也不会发生。
When I remove the 4u class using chrome developer, the page is affected. However, when I delete this section from the css file, nothing happens. I am quite stumped in this, and it is really bugging me!
推荐答案
阅读此规范： http://www.w3.org/International/questions/qa-escapes#cssescapes 。反斜杠后面的字符表示Unicode代码点。如果允许下一个字符作为十六进制值的一部分，则需要空格。
Read this spec: http://www.w3.org/International/questions/qa-escapes#cssescapes. The characters following the back slash represent a unicode code point. The space is required if the next character is allowed as part of the hexadecimal values.
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