module documentation

Miscellaneous transforms.
Class ​Call​Back Inserts a callback into a document. The callback is called when the transform is applied, which is determined by its priority.
Class ​Class​Attribute Move the "class" attribute specified in the "pending" node into the immediately following non-comment element.
Class ​Transitions Move transitions at the end of sections up the tree. Complain on transitions after a title, at the beginning or end of the document, and after another transition.