Hasp – A minimal CSS preprocessor using the M4 macro language

In plain words

Hasp is a minimal CSS preprocessor built on the M4 macro language. It allows developers to use macros and automation in their CSS workflows, offering a lightweight alternative to more complex preprocessors. Designed for developers who prefer simplicity, Hasp provides basic preprocessing capabilities without unnecessary overhead. The project is open-source and available on GitHub for contributions.

written from the facts on this page · September 2026

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