Sometimes they might be. But even if you know the font size of the headers, the contents, and the bulleted lists, you still won't know where the paragraphs wra

Sometimes they might be. But even if you know the font size of the headers, the contents, and the bulleted lists, you still won't know where the paragraphs wrap, unless you also require a fixed-width font, and don't allow any of the word lengths to change. But then we probably wouldn't be calling it a "modern library for PDF generation".