I built a screen recorder with no backend - and 3 browser bugs nearly beat me (opens in new tab)

A while back I needed to send a teammate a 30-second screen recording. Every tool wanted me to install an app or create an account first. For half a minute of video. So I built the thing I actually wanted: open a tab, hit record, get an MP4. No install, no signup, nothing uploaded unless you choose to share. It's YoRecord, and it runs entirely in the browser. Capture is the easy part - getDisplayMedia() for the screen, getUserMedia() for webcam+mic, MediaRecorder to encode. The hard part is e...