A question I get asked a lot is why numbered headings matter in EPUB. HTML5 defined a fancy new algorithm that can correct your headings after all, right? (Albeit in weird and wonderful ways if you don’t follow every nuance!)
The answer to the HTML5 question I’ll get to, but I can never seem to stress enough that getting headings right in your documents is a key component of their overall accessibility. There are two primary ways that readers will move through your ebook at the markup level (or DOM/accessibility tree level, to be specific).
One method is the table of contents, but while it provides the structure of the document, constantly having to open it to move a section or two ahead or back is not the most user-friendly approach to navigation.Continue Reading Use Your Headings