CSS Masking

Last reviewed Jun 1, 2026 Content v20260601

This lesson

This lesson teaches CSS Masking—the ideas, syntax, and habits you need before moving on in CSS.

Without a solid grasp of CSS Masking, you will repeat mistakes in CSS exercises and on real pages or scripts.

You will apply CSS Masking in contexts like: All browser UIs, component libraries, marketing sites, and many native apps that reuse web views.

Read the lesson, edit HTML/CSS in the playground, press Run to preview, then answer the lesson MCQs.

When intermediate lessons feel comfortable and you are ready for production-style trade-offs.

Masking reveals selected parts of content via alpha/luminance masks for advanced visual effects.

Masking support and rendering behavior vary across browsers; test fallbacks for critical UI.

Q: Masking vs clip-path?
A: Masking uses alpha/luminance gradients; clip-path uses geometric clipping.
Q: Why provide fallbacks?
A: Visual support differs and masked content can disappear unexpectedly.
Q: Best use case?
A: Decorative edges, fades, and reveal effects where fallback is acceptable.

Practice: Change one property in the playground and observe cascade + layout in DevTools.

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