How does the clamp() function help with responsive typography?

• A. It fixes the font size to a single value.
• B. It scales font size linearly with the viewport.
• C. It clamps a value between a minimum and maximum value using clamp(min, preferred, max).
• D. It ignores minimum and maximum constraints.

Answer: (C)

The clamp() function provides a bounded, fluid value that’s ideal for responsive typography. You give it a minimum size, a preferred, fluid value, and a maximum size, and it outputs a final font size that stays within those limits. In practice, you often use a fluid unit like a viewport width (for the preferred value) so the text scales with the screen, but the min and max keep it readable and prevent it from getting too small or too large. For example, font-size: clamp(14px, 2vw, 22px) ensures the text grows with the viewport but never drops below 14px or exceeds 22px. This approach avoids the drawbacks of fixed sizes (which don’t adapt) and pure viewport-based scaling (which can become unreadable on extreme sizes) by bounding the range.