foundation
CSS Debugging Tools
DevTools workflows for inspecting cascade, grid/flex overlays, and performance.
Learning checklist
- Grid/flex overlays
- Performance profiling
- Source maps & coverage
Definition
DevTools workflows for inspecting cascade, grid/flex overlays, and performance.
Syntax
Example
Deep dive
Why this matters
Principles, mental models, and debugging clues tailored to the topic.
Visual intuition
Each property is paired with motion or color feedback so you build muscle memory, not just recall syntax.
Copy-ready CSS
Controls emit exact CSS you can copy. Use it as a starter token or paste into DevTools for instant validation.
Performance notes
Learn where reflow, repaint, or compositing occurs so you avoid jank and choose GPU-friendly paths.
Accessibility first
Focus-visible, reduced-motion, and contrast tips are woven into every lab to keep experiences inclusive.
Practice
Try recreating a UI card using this topic. Toggle between dark and light modes to validate token contrast and responsiveness.
Tip: use DevTools overlays (grid/flex) plus the copy CSS button.
CSS Debugging Tools — Live Playground
Edit the CSS to experiment with the concept. Styles apply live to the preview card.
Try these ideas:
- Grid/flex overlays
- Performance profiling
- Source maps & coverage
Play with CSS Debugging Tools props
Adjust CSS on the right to see live changes.