Audience
Programming Language solution for developers
About Less
Less (which stands for Leaner Style Sheets) is a backwards-compatible language extension for CSS. This is the official documentation for Less, the language and Less.js, the JavaScript tool that converts your Less styles to CSS styles. Because Less looks just like CSS, learning it is a breeze. Less only makes a few convenient additions to the CSS language, which is one of the reasons it can be learned so quickly. Mixins are a way of including ("mixing in") a bunch of properties from one rule-set into another rule-set. Less gives you the ability to use nesting instead of, or in combination with cascading.
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CSS
CSS, short for Cascading Style Sheets, is a style sheet language used by web developers to structure the HTML and other elements of a website. CSS is one of the most widely used languages on the web. For style sheets to work, it is important that your markup be free of errors. A convenient way to automatically fix markup errors is to use the HTML Tidy utility. This also tidies the markup making it easier to read and easier to edit. I recommend you regularly run Tidy over any markup you are editing. Tidy is very effective at cleaning up markup created by authoring tools with sloppy habits. Each style property starts with the property's name, then a colon and lastly the value for this property. When there is more than one style property in the list, you need to use a semicolon between each of them to delimit one property from the next.
Learn more about CSS
PureScript
PureScript is a strongly typed, purely functional programming language that compiles JavaScript. It enables developers to build robust web applications, web servers, and mobile apps using functional programming techniques. PureScript offers features such as algebraic data types, pattern matching, row polymorphism, extensible records, higher-kinded types, type classes with functional dependencies, and higher-rank polymorphism. The language emphasizes strong static typing and pure functions, ensuring code reliability and maintainability. Developers can compile PureScript code into readable JavaScript, facilitating seamless integration with existing JavaScript codebases. The ecosystem includes an extensive collection of libraries, excellent tooling, and editor support with instant rebuilds. An active community provides numerous learning resources, including the PureScript book, which offers practical projects for beginners.
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JSON
JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write. It is easy for machines to parse and generate. It is based on a subset of the JavaScript Programming Language Standard ECMA-262 3rd Edition - December 1999. JSON is a text format that is completely language independent but uses conventions that are familiar to programmers of the C-family of languages, including C, C++, C#, Java, JavaScript, Perl, Python, and many others. These properties make JSON an ideal data-interchange language.
JSON is built on two structures:
1. A collection of name/value pairs. In various languages, this is realized as an object, record, struct, dictionary, hash table, keyed list, or associative array.
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These are universal data structures. Virtually all modern programming languages support them in one form or another.
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Norma
Norma checks AI-generated code against a governed rule library and returns the same verdict every time.
It runs in two places. Livecheck evaluates a file or snippet on demand, called from an MCP-capable editor such as Cursor, Claude Code, Windsurf or VS Code. Full Scan audits a whole GitHub or Bitbucket repository, detecting the stack and frameworks without a configuration file, and returns findings ranked by severity with the context needed to fix them.
Rules are evaluated by static analysis, so a result does not move between runs. Rule content comes from SOLID design principles and per-stack conventions, and each rule can be switched off where it does not apply. Coverage spans JavaScript, TypeScript, Python, PHP, Java, Node, React and Supabase.
The MCP server exposes link_repository, get_rulesets, get_rules_for_ruleset, live_check, get_open_issues and register_applied_actions, with OAuth and is on the Official MCP Registry
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Pricing
Starting Price:
Free
Free Version:
Free Version available.
Integrations
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Less
lesscss.org
Videos and Screen Captures
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Product Details
Platforms Supported
Cloud
Windows
Mac
Linux
Chromebook
Training
Documentation
Support
Online
Less Frequently Asked Questions
Q: What kinds of users and organization types does Less work with?
Less works with these users and organization types: Mid Size Business, Small Business, Enterprise, Freelance, Nonprofit, Government, and Startup.
Q: What languages does Less support in their product?
Less supports these languages: English.
Q: What kind of support options does Less offer?
Less offers support via online.
Q: What other applications or services does Less integrate with?
Less integrates with: Nova, Codacy, Dash, MyEclipse, PhpStorm, Refraction, RubyMine, SlickEdit, Typora, and Visual Studio Code.
Q: What type of training does Less provide?
Less provides training in the form of documentation.
Q: How much does Less cost?
Pricing for Less starts at Free.
