CSS Comments

Last reviewed May 28, 2026 Content v20260528

This lesson

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

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

You will apply CSS Comments 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.

Comments explain non-obvious intent in CSS and help teams maintain complex style systems.

/* This is a CSS comment */

Commenting obvious declarations creates noise. Comment intent, not mechanics.

Q: What should CSS comments capture?
A: Constraints and rationale that are not obvious from declarations.
Q: Are comments shipped to users?
A: Usually stripped in minified production bundles.
Q: Why avoid stale comments?
A: Outdated comments mislead future maintainers more than no comment.

Pitfall: Check cascade order—author stylesheet loses to inline styles and !important surprises.

Can you explain this lesson in 30 seconds without reading notes?

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