Yes, this. In the project I was doing, using chromium as a command-line interface I remember having options to do the pagination to a custom resolution, which

Yes, this. In the project I was doing, using chromium as a command-line interface I remember having options to do the pagination to a custom resolution, which I used to define a render 'window' as if the browser screen was on something like a 1600x18000 monitor. so I had the entire webpage displayed like a full scroll without page breaking like it would have if you just printed a PDF from Chrome. And this allowed me to then extract this giant full length vector graphics result of diagrams and text into a single SVG that was perfectly spaced and rendered in the aspect ratio I wanted.