Links are pretty straightforward. How does this link to the Electric Book website look? That link probably shouldn’t show in the PDF version for print, or it should show in a useful way (like including the link in plain text).

Buttons are trickier. Basically, buttons should be defined by adding a .button class to any element. Ideally the theme allows for inline buttons and block-level buttons:


Again, the print version should have a way to deal with these. Alternatively, the book author can hide buttons in the print version. For instance, themes may support adding a .non-printing class to the element. Or the author can use Liquid control-flow tags, like {% if site.output == "print" %}, to control whether and how buttons appear in print.