alt Hacker News> correct behavior on windows size change
Except the PDF is not responsive at all and you can't increase or decrease the font size without increasing the whole width of page.
> Some vendors have switched to online-only for some documents and it always annoys me.
HTML shouldn't mean online-only. If the vendor isn't trying to make it hard to download, you should always be able to convert to PDF. But PDF to HTML is very hard or impossible.
In any technical/scientific document I do not want to increase or decrease the size of any element, e.g. of one of the fonts.
You only want to do an overall proportional zoom, when needed.
A well-designed document page has appropriate size ratios between various kinds of texts, formulae, tables and images, which should not be corrupted by changing the size of a single element.
The pages where the author has not formatted them adequately are ugly and hard to understand, which is what you typically see when this kind of content is written as HTML/EPUB documents, which are rendered non-deterministically.
Lazy writers may like HTML, but readers who must read and search through vast amounts of technical documentation do not like it.
There are many good PDF readers that are adequate for reading and searching even huge documents, but I have never seen any tool that works acceptably for EPUB/HTML big documents, which is not surprising because no tool can compensate the fact that the writer of the document did not design the layout of the pages carefully.