Clearly I have no idea what Ladybird browser is. Why should I be impressed? I would expect every browser to be capable of this.
EDIT: Lots of great answers. Thanks everyone. Glad this inspired such lively discussion.
~~I think its a browser writing by one person.~~
Edit: the point is that its an independent browser, not that its built by just one person
I don't think this is true? If nothing else, github[0] lists 30 contributors.