MDL-44079 Javascript: Check whether a dialogue is focused before closing
MDL-44079 Javascript: Closing a tooltip should pass event details
MDL-44079 Javascript: EditPDF editor should be modal
MDL-44101 Javascript: Introduce a module to focus after widget close

This module supports focusing on a specified Node, or attempting to
determine the Node which caused the displayed the Widget to return focus to
that location.
MDL-44101 Javascript: Apply widget-focusonclose to some core dialogues