Cheat Sheet
| Question | Core Idea | Senior Signal |
|---|---|---|
| Q136 | DevTools | Use logs for signal, breakpoints for precision, and call stacks for ownership. |
| Q137 | Source maps | Production stack traces need source maps tied to exact release artifacts. |
| Q138 | User Timing | Use marks and measures for product-specific milestones. |
| Q139-Q140 | Compatibility | Define support with data, test critical paths, and design fallbacks explicitly. |