In 2014 I helped design and create an on-line magazine for retro enthusiasts called In Retrospect Magazine.
The idea of the site was to present the content as if you where viewing an actual page spread layout on paper but using HTML and CSS rather than a straight PDF viewer systems such as ISSUU. The added benefit of this, aside from SEO and data loading speed was that this content could be re-arranged on the fly when viewing the site on different devices and platforms.
When the magazine transformed into a fully fledge printed magazine (thanks to a Kickstarter campaign), the printed layouts could be copied exactly into HTML so that readers could preview what was in the physical magazine on-line before buying the issue in question.