Less.js 2.6.0 发布了，改进记录包括：

• Underscore now allowed in dimension unit

• Fixes for import by reference

• Fix for #2384 Changes HTTPRequest "sync" setting to simply hide the page until less has rendered, browser version is now orders of magnitude faster.

• Added ability to cache stylesheets while using modifyVars

• Error when when image-size functions are used in browser-less

• Fixed extend leaking through nested parent selector. #2586

• Added "or" keyword and allowed arbitrary logical expression in guards

• Fixing #2124 - Parsing Error "Unrecognised input" for color operations

• Logical operator and now has higher precence then logical operator or.

• Allow unknown at-rules w/o {} block

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).