The Perfetto UI is a fascinating project to work on because it often faces performance problems which you wouldn’t see in more “normal” webapps. I learn about all sorts of weird web features by reviewing PRs for the UI. Two such features I just learned about: will-change (PR): a hint, to be used sparingly, to tell the browser that a certain property of a DOM element will change in the near future. isolation (PR): I feel MDN didn’t do a great job of explaining so I asked Claude which g...
