Ideas, tutorials, and updates from our team.
An embedded widget can read the page's html lang, the visitor's navigator.languages, or what the site tells it. They often disagree. The order we chose for BugDump's widget, why the page goes first, and the small things that broke along the way.
Your app has a dark mode toggle. The chat bubble, feedback widget, and cookie banner ignore it. Why prefers-color-scheme is the wrong signal for embedded widgets, and the small API that fixes it.
A third-party widget that ships 450 KB to every visitor has to justify it. Ours couldn't. Here's the measurement, the fix, and the thing about defer that turned out to be wrong.
DevTools is open on the wrong machine. Here's how to instrument console, errors, fetch, and XHR so a user's browser can tell you what actually happened — and the traps that make naive implementations break the page they're monitoring.