acss (Aural Cascading Style Sheets)
The position and size of an element's box(es) are sometimes calculated relative to a certain rectangle, called the containing block of the element.
The containing block in which the root element lives is a rectangle called the initial containing block.
functionality in printed publications where content from the document is adorned, replicated, or moved in the final presentation of the document. Along with multi-column layout and paged media, gcpm offers advanced functionality for presenting structured documents on paged media. Paged media can be printed, or presented on screens.