To Do list

This page holds information about issues that we've determined need clarification, but a home for the clarification has not yet been determined.

Menus can contain menubars, and menubars can contain menus. Explain how this works, and which one would one use as the outermost container? Also relationship of toolbars to menubars.
If instances of a role must appear as children or descendants of instances of another role (e.g., listitems must be in a list), descendants of that role inherit the same rules. The rules must be carefully constructed, and it is not the case that the container restrictions are mutual. E.g., a role may be required to have certain descendants, but those descendants can appear in multiple types of parents. Or a role may be required to appear in a particular parent, but that parent is not restricted to have only that role as a descendant.
Cover the association of tabs and tabpanels by labelledby and controls, and check against what the Style Guide group is assuming is the behavior.
Explain trees very thoroughly, including general case, and the special case of "sliced trees" in which level and setsize must be used.
Describe various sorting algorithms, related to the sort property. Combination of ARIA properties and existing components.