WordPress CSS Coding Standards

Like any coding standard, the purpose of the WordPress CSS Coding Standards is to create a baseline for collaboration and review within various aspects of the WordPress open source project and community, from core code to themes to plugins. Files within a project should appear as though created by a single entity. Above all else, create code that is readable, meaningful, consistent, and beautiful.

Source https://developer.wordpress.org/coding-standards/wordpress-coding-standards/css/
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