DomTerm (https://domterm.org https://domterm.org) uses the Golden Layout library (https://github.com/golden-layout/golden-layout https://github.com/golden-layou

DomTerm (https://domterm.org https://domterm.org) uses the Golden Layout library (https://github.com/golden-layout/golden-layout https://github.com/golden-layout/golden-layout). As far as I can tell, this does everything mentioned in the article. It also supports tabs, and you can also reposition terminal windows by dragging, neither of which I saw mentioned in the article. (I'm currently working on being able to drag between top-level windows. It sort-of-works, but only at the proof-of-concept level.)