How HTML changes in ePub

ePub is the W3C standard for ebooks. It lets you take your knowledge of the web, and use it to produce little self-contained sets of documents that can be freely distributed as a single file ready for reading on extremely low-power devices, and they even reflow to fit any screen. Yet while I said that you can use your knowledge of the web to build ePubs, the technology in use is twisted in…