Is there a just GUI framework for creating flow like wysiwgy editors?

I wanted to make a gui for an editor similar to the totaljs.com editor. In the vain of other flow like editors like noflojs. I started with pixijs, a general game engine. But quickly got stuck in the weeds trying simply work out element positioning and dimensions. I don't have any game dev or gui experience and I've never used linear algebra to do this kind of thing. Since my need is very specific, I just want to be able to create a space where I can drag and drop "components" into a canvas and connect them and tie some behavior to them. Any tools out there to help with rendering something like that?