1 min lesson
Micro-interactions & the 90→100 polish
Think through this situation. "A keyboard user tabs to an icon button and no focus ring appears. Which fix is right?" Give the practical answer in plain words.
Step 1 of 3
The Design Engineer posting Cursor ran, captured on 2026-07-22, asks for someone who knows what it takes to get from 90% to 100%. That last 10% is almost entirely micro-interactions and states, the work most engineers skip and most users feel.
A button that works is 90%. A button that has a focus-visible ring, a satisfying active depression, a hover transition tuned to ~120ms, a hit target that extends past its visible bounds and a disabled state that explains itself: that is the 100% the posting describes.