Your question is Cross-Browser Compatibility in Legacy Environments. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
How do you approach cross-browser compatibility issues in a legacy-heavy environment?
Explain how you would identify browser-specific failures, prioritize support, and choose between progressive enhancement, polyfills, transpilation, CSS fallbacks, and targeted workarounds. Discuss testing, monitoring, regression prevention, and how you would manage compatibility without destabilizing existing users.