That's very cool!
1. Is the source available anywhere? I'm curious to see how it works.
2. Is there a way to connect the structure displayed here, to the rendered version in the PDF? To visually display the subcomponents?
1. Is the source available anywhere? I'm curious to see how it works.
2. Is there a way to connect the structure displayed here, to the rendered version in the PDF? To visually display the subcomponents?
It's a bit different if you are looking at a tagged PDF, where the tagging structure is in there, but if you want to look at that in detail you are probably better served with e.g. ngPDF (https://ngpdf.com/) which will show the tagging structure including the mapping to rendered elements.
It heavily relies on the core part of PDF.js: I've made a fork of the PDF.js project, removed everything not related to the core part, and added an export for low-level primitives [1].
Also, as inspiration, I used the pdf.js.utils [2] project, which almost does the same but in a different form.
I wouldn't worry about the quality of the code. You get better by seeing other people's work and seeing alternative solutions to the problems you had.
Also, as I mentioned in another comment, this could easily be built into a quick trouble-checking app for POD work. Posting it would also let people fork it to make more task-specific apps.