I don't think it is very similar. Personally i thought of HoTMeTaL, an old HTML/page editor that was popular for a little bit during the 90s and had a similar approach of showing the page in a visual quasi-WYSIWYG + quasi-element-tree mode.
Wow, it's been a minute since I used HoTMeTal, I loved that editor. I cranked out a lot of HTML with it, once you got the hang of what it wanted you to do, it would be your best friend. We switched to Dreamweaver, of course that lasted until Adobe bought it. But thanks for the memory, this thread has been the Saturday treat.
