I didn’t read that anywhere. I pulled up some demos a few weeks back and noticed that they are just drawing on a huge canvas. Maybe I’m wrong, but take a look:
Oh - I see. There are 2 methods you can render in.
HTML renderer
Uses a combination of HTML elements, CSS, Canvas elements, and SVG elements. This renderer has a smaller download size.
CanvasKit renderer
This renderer is fully consistent with Flutter mobile and desktop, has faster performance with higher widget density, but adds about 2MB in download size.
All the samples I found must be CanvasKit renders. Deleting not to spread misinformation.