They don’t mention whether the custom elements are using shadow root and whether it’s open or closed mode.

That has implications for event handling and style encapsulation.

it is easy to check using inspect. They are not using shadowDOM which is great.

I mean they mention the built in browser features they use, but make no mention of the actual authoring of the components unless I’m missing something. I’m curious if they’re leaning on existing frameworks for authoring web components or if they’re implementing them from scratch.