About Course
CSS custom properties, often called CSS variables, let you store values such as colours and spacing once and reuse them across a stylesheet. Learn how to declare them, use var() with fallbacks, take advantage of inheritance for themes such as dark mode, update them from JavaScript and register typed properties with @property.
Tutwoo is an independent learning provider. This course is written from the official documentation listed in the sources, which can change, so always check the current documentation for the version you use. It is not endorsed by any of the organisations listed and is not an accredited qualification.
© 2026 Tutwoo UK Limited. This course was created in-house by Tutwoo and is our original work. It is for your own learning only: please do not copy, share, record or resell it.
Course Content
Course Lessons
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Declaring and using custom properties
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Fallbacks and invalid values
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Inheritance, the cascade and theming
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JavaScript and @property
Sources & Further Reading
Final Assessment
Student Ratings & Reviews
