LESS is open source, and its first version was written by Ruby, but in subsequent versions, Ruby was gradually replaced by JavaScript. Thanks to JavaScript, there are fewer things that can run on the client (IE6+, Webkit, Firefox) or the server (Node.js, Rhino). As an extension of CSS, LESS does not reduce the functions of CSS, but adds many other functions to the existing CSS grammar, so learning LESS is a relaxed and pleasant thing. Let's study together!
Grammatically speaking, LESS is close to CSS, and the legal CSS code segment itself is also a legal LESS code segment. LESS provides an abstract mechanism for general programming such as variables, nesting, mixing, operators and functions. The latest version is 2.5. 1.