I tried a pretty heavy website and was pleasantly surprised, that windy.com nearly works now. It's slow, granted, but the layout looks fine and the map and the other items render fine, except for the particles.

It looks like Ladybird (2534e7a) renders the particle layer background black for some reason, instead of transparent, blocking the view on the map and the rendered weather information:

Hope someone can fix this, so we can look up weather with Ladybird :)