Rule: ARIA required context role (ff89c9)

[annethyme]

Closes #194, closes #302

How to Review And Approve

• Go to the “Files changed” tab
• Here you will have the option to leave comments on different lines.
• Once the review is completed, find the “Review changes” button in the top right, select “Approve” (if you are really confident in the rule) or "Request changes" and click “Submit review”.

[nitedog]

Mostly there but agree with Wilco on trying to simplify some of the language

Updated. Please review again.

See replies to comments.

Review has been updated

[Jym77]

• Many editorial changes in polishing the description of examples.
• A maybe naive question about the applicability to implicit roles (I must miss some point here…)
• A real concern about the limitation of "owned by" to children rather than descendants.

[Jym77]

Suggested change

	Element with [explicit semantic role](#explicit-role) `listitem` is contained within its [required context role](https://www.w3.org/TR/wai-aria-1.1/#scope) `list`, expressed as an [explicit semantic role](#explicit-role).
	The `div` element with an [explicit semantic role](#explicit-role) `listitem` is contained within its [required context role](https://www.w3.org/TR/wai-aria-1.1/#scope) `list`, expressed as an [explicit semantic role](#explicit-role).

[WilcoFiers]

Unnecessary.

[Jym77]

Can we at least go for

Suggested change

	Element with [explicit semantic role](#explicit-role) `listitem` is contained within its [required context role](https://www.w3.org/TR/wai-aria-1.1/#scope) `list`, expressed as an [explicit semantic role](#explicit-role).
	The element with an [explicit semantic role](#explicit-role) of `listitem` is contained within its [required context role](https://www.w3.org/TR/wai-aria-1.1/#scope) of `list`, expressed as an [explicit semantic role](#explicit-role).

in order to make it a proper English sentence.

[Jym77]

Suggested change

	Element with [explicit semantic role](#explicit-role) `listitem` is contained within its [required context role](https://www.w3.org/TR/wai-aria-1.1/#scope) `list`, through the [implicit semantic role](#implicit-role) of `ul`.
	The `div` element with an [explicit semantic role](#explicit-role) `listitem` is contained within its [required context role](https://www.w3.org/TR/wai-aria-1.1/#scope) `list`, through the [implicit semantic role](#implicit-role) of the `ul` element.

[Jym77]

Suggested change

	The `listitem` has an [explicit semantic role](#explicit-role), but it is identical to the [implicit semantic role](#implicit-role), making the element inapplicable.
	The `li` element has an [explicit semantic role](#explicit-role), but it is identical to its [implicit semantic role](#implicit-role), making the element inapplicable.

[Jym77]

I'd still use

Suggested change

	The `listitem` has an [explicit semantic role](#explicit-role), but it is identical to the [implicit semantic role](#implicit-role), making the element inapplicable.
	The `listitem` has an [explicit semantic role](#explicit-role), but it is identical to its [implicit semantic role](#implicit-role), making the element inapplicable.

Resolved everything I think needs resolving, left comments for the rest of it.

[Jym77]

Mostly happy with changes. I'm still a bit in the dark about this:
#255 (comment)