CSS 壓縮工具 rCSSmin

RCSSmin 是一個 CSS 壓縮工具，基于 YUI compressor 的語義實現。提升了壓縮的速度和比例。

以下是它的一些功能特性：

• Strings are kept, except that escaped newlines are stripped
• Space/Comments before the very end or before various characters are stripped: :{});=>+],! (The colon (:) is a special case, a single space is kept if it’s outside a ruleset.)
• Space/Comments at the very beginning or after various characters are stripped: {}(=:>+[,!
• Optional space after unicode escapes is kept, resp. replaced by a simple space
• whitespaces inside url() definitions are stripped
• Comments starting with an exclamation mark (!) can be kept optionally.
• All other comments and/or whitespace characters are replaced by a single space.
• Multiple consecutive semicolons are reduced to one
• The last semicolon within a ruleset is stripped
• CSS Hacks supported:
  • IE7 hack (>/**/)
  • Mac-IE5 hack (/*\*/.../**/)
  • The boxmodelhack is supported naturally because it relies on valid CSS2 strings
  • Between :first-line and the following comma or curly brace a space is inserted. (apparently it’s needed for IE6)
  • Same for :first-letter
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