Less CSS 框架发布了 2.2.0 版本，改进记录包括： do not apply relative paths to svg-gradient and data-uri functions data-uri output using import filename interpolation and import inline together now works deprecate the compression option (still works, but outputs a warning unless silent) The node version of less now has image-size, image-width, image-height which return the image dimensions of a file Fixed an issue that could cause the parse to occur more than once and the callback be called multiple times if you are outputting to the console, lessc defaults to silent so warnings do not end up in output isunit function supports '' to test if a dimension has no unit data-uri function now counts characters after base64 encoding instead of bytes before encoding to determine ie8 support fix bug effecting guards on pseudo class selectors do not cache on the browser when used with modifyVars detection if less does not parse last character in file detection of whether a file is css now requires /css, .css, ?css,
&css instead of just css. You can still tell less the type of file
using import options. remove extra new line added to sourcemap entry inline file support safari extension less.parse now exposes a way to get the AST. We do not recommend you use this unless you need to.
Less CSS 是一个使用广泛的 CSS 预处理器，通过简单的语法和变量对 CSS 进行扩展，可减少很多 CSS 的代码量。 LESS 将 CSS 赋予了动态语言的特性，如 变量， 继承， 运算， 函数. LESS 既可以在 客户端 上运行 (支持IE 6+, Webkit, Firefox)，也可一在服务端运行 (借助 Node.js). 
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