@russian-dima I’m often thinking about something like that, because I could, like Scott, really use it. HTML-window would not be my first choice, have experience with it, it’s becoming troublesome because browsers are nailing down iframes more and more.
A Wix element would be better (no iframes), but it’s a lot of work: rewriting good parts of $w, doing data binding, digging into html5 to produce mobile version, it’s not a project to take lightly. So to Scott, the answers is : no, I wouldn’t know of any external Widget that would solve this problem.