LESS is a preprocessor that extends CSS functionality, including variables, nesting, functions, and more, making CSS more efficient and manageable. It does not directly 'support' specific UI/Theme frameworks, but it can be used to develop or customize any CSS-based framework.
However, many popular UI frameworks support LESS. Here are some examples:
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Bootstrap: The original version of Bootstrap was written in LESS, allowing developers to easily modify core styles by adjusting variables and mixins. Although the latest versions of Bootstrap (4 and 5) have shifted to using Sass as their primary CSS preprocessor, many projects and developers still use the earlier LESS-based versions.
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Semantic UI: This is a feature-rich UI component library that provides LESS files, making it easier for developers to customize styles.
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Ant Design: A well-known React UI library that provides a complete set of LESS variables and structures, enabling deep customization and theming for developers.
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UIkit: Another lightweight and modular frontend framework, UIkit provides source files written in LESS, simplifying customization and extension.
An example of using LESS for theming and customization in these frameworks is that developers can modify Bootstrap's LESS variables to change theme colors, font sizes, or margins without directly modifying CSS files. This enables more maintainable and scalable codebases.
In summary, while LESS may not be as widely used as Sass in the latest UI frameworks, it still plays an important role in many older projects and specific scenarios.