You're right, but bootstrap forces your html to have a certain structure (everything should go in a container div, in columns or lines, ...) So it is more a fr

You're right, but bootstrap forces your html to have a certain structure (everything should go in a container div, in columns or lines, ...) So it is more a framework in that aspect in my opinion. But it had also "components" which are more library-like (buttons, bars, cards, tooltips...). So I'd say it's both.