Don't quite follow you, but if you're talking about a box-based layout for the web, that's a little overly simplistic as "the" layout, but is already possible. Keep in mind the historical underpinings; web documents were always more like scrolls than screens.
Not really, I’m not thinking to replace CMS builders like Wix or Squarespace either.
More like ”no-code design directly in HTML and CSS”, but with familiar Figma/Sketch-line controls for sizing, alignment, etc. Responsive by default, boxes full-width and vertically sized by content by default, manual pixel sizing of elements heavily discouraged in favor of block/inline-block/inline. Sane defaults for theme tokens, but easily customizable.
In other words, a hands-on design tool for web layouts, working directly on the DOM and stylesheet, preferring the flow for positioning and leveraging (normalized) HTML/CSS defaults.
My thinking is mostly born out of frustration with the performance of flexbox-inside-flexbox layouts and the total disparity of text layout between web and existing design tools.
