[ElMiko]

Yeah, RbnJrg, I see we're kind of talking past each other, and I apologize for that. As I mentioned before, I have no doubt that the svg solutions you've proposed would pre-empt the problems of a non-svg approach. The nature of my question in post #33 wasn't really about HOW to get a full screen, proportional image (a problem for which you've already provided extremely thorough responses), but rather a questions about WHY the non-svg approach was behaving in the way that it did.

So, for example, while you have a solution to fitting the image on a single page (by reducing the height to 99%, which is what I had done and adding a contingent vh specification), I'm puzzled by why 100% height would produce greater than 100% height in the non-svg example, despite having set the html, body, and container to 100% as per the Josh Comeau article.

Likewise, I understand that an SVG wrapper would preempt the variously scrolling/squeezing issues, but don't understand why Sigil treats it one way and Calibre treats it another.