CSS Fonts

Last reviewed May 28, 2026 Content v20260528

This lesson

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

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

You will apply CSS Fonts 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.

Font choices affect perceived quality, loading performance, and reading comfort.

Always include fallbacks. Example: custom font first, then system-ui and generic family.

font-family: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;

Q: Why can web fonts hurt performance?
A: Extra requests and render delays if loading strategy is poor.
Q: Why include fallback fonts?
A: Ensures stable rendering if custom font fails or loads slowly.
Q: What is FOIT/FOUT?
A: Invisible text vs unstyled text during font load transitions.

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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