Tree Inclusion focus/activedescendant requirements need clarification… - #950

According to multiple dictionaries, placeholder is a single word, and so should not be camelCased.

 (#947)

…81 (#972)

* aria-expanded: revise definition and change applicability

Resolves issue #681 by:
* Revising aria-expanded definition to state it aria-expanded belongs on interactive, focusable, controlling element.
* Rewording normative authors SHOULD to clarify when aria-controls should be used.
* Trimming unnecessary content from aria-expanded description related to grouping mechanisms and the benefits of collapsing content.
* Removing support from document, section, sectionhead, and window.
* Restoring support to following subclass roles that were effected by removals: gridcell, listbox (for issue #722), row, rowheader, tab, and treeitem.
* Adding support for checkbox.
* Adding aria-expanded as supported for role application

Thus, support is removed from the roles listed below that do not act as interactive, focusable, controlling mechanisms for expansion:

alert
alertdialog
article
banner
blockquote
caption
cell
complementary
contentinfo
definition
deletion
dialog
directory
feed
figure
form
grid
group
heading
img
insertion
label
landmark
legend
list
listitem
log
main
marquee
math
menu
menubar
navigation
note
paragraph
radiogroup
region
search
select
status
subscript
superscript
table
tabpanel
term
time
timer
toolbar
tooltip
tree
treegrid

* Remove implicit value from heading role
* Adjust heading role verbiage to reflect aria-level authoring expectations

* Remove default value for aria-expanded from Budugbox role
* Update Budugbox role prose to better reflect removal of default aria-expanded value

Fixes #977.

…ference list”. (#964)

update 5 instances of “IDREF” to "ID reference" or "ID reference list”.
Did not update instances where “IDREF” was specifically linking to https://www.w3.org/TR/xmlschema11-2/#IDREF

From e7a08aa

…ring option for definition

)

Addresses #860
* Reword slider role prose to reflect that aria-valuemin, valuemax are now supported, not required
* Remove aria-valuenow repair techniques from inline in the slider role
* Make fallback table more robust for aria-valuenow on slider role
* Add pointer to the fallback table from slider role
* Remove supported but not required attrs on slider from the author error handling table

…#944)

Addresses #858

* Update scrollbar role prose to better reflect properties moving from 'required' to 'supported'
* Scrollbar role: remove aria-valuenow repair techniques to the fallback table and point to said table
* Remove supported but not required attrs on scrollbar from the author error handling table

- add "controlled by"
- link to "owned" definition
- add back clause about required context role