What is the benefit of using relative units for typography across viewports?

• A. Inconsistent text sizing
• B. Ensures legibility across viewports
• C. Slows rendering
• D. Increases complexity

Answer: (B)

Using relative typography units lets text scale with the viewing environment, so its size adapts as the viewport changes. When you base sizes on the root font size (rem) or on the viewport, the text grows or shrinks in proportion to the device, keeping it readable on small screens and appropriately sized on large displays. This directly supports legibility across viewports and also respects user font-size preferences and browser zoom, which is essential for accessibility. In contrast, fixed units lock text to a specific size, which often leads to unreadable text on some devices and breaks consistency as the screen changes.