I wish they support Linux wholeheartedly, a lot of toolkits and GUI frameworks do it by half-assing things, mostly because Wayland is difficult to understand.

In Wayland you have multiple ways to render windows, not just the XDG top level window. It works via surfaces, and here is a list I've discovered so far:

  - XDG Top Level Window
  - Child Window
  - Popup Surface
  - Layer surface (like task-bars, shell overlays)
  - Subsurface (region in another surface)
  - IME Panel Surface (surface that follows text cursor)

There probably is others too.

It is diffifcult to find high-level toolkits that support all of the above.