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.