The answer used to be absolutely yes because, if you used
px units, you prevented the text from being resized by the user at all.
But browser zoom is the default method for making everything bigger (including text) these days and it works great even if you use
But… Kathleen McMahon really digs into this and finds that it’s still worth setting all your type (both
line-height) in relative units because:
- setting type in
pxprevents browser settings from making font size adjustments (which some people definitely use) and
- setting type in relative units maintains greater design fidelity as users use browser zoom (which a lot of people definitely use).