Drag a page or a cover to turn it; drag the table to orbit; scroll to zoom. With the pan tool, or Space held, a drag pans. Arrow keys orbit; Page Down and Page Up, or a tap of Space, turn pages. Click, select and type in a page's text block. In the HTML, data-book-face="front-cover", "inside-front-cover", "front-endpaper", "page", "back-endpaper", "inside-back-cover" or "back-cover" puts a section on that face; data-book-folio="none" drops the page number from the pages a box is on.
Preparing GPU.