CSS Layout Debug Playbook
A practical sequence for fixing broken layouts fast.
Frontend Notes1 minInspired by Production UI debugging
Start with boxes
Inspect display, position, width, and overflow before tweaking spacing.
Check parent constraints
Most bugs come from ancestor constraints, not the child component itself.
Isolate quickly
Temporarily remove transforms and animations to identify structural issues. If the bug spans layout and paint, start from How Browsers Work.