"ARIA required context role" (ff89c9): resolve TF feedback (#1554)

* Inline def of owned elements

Co-authored-by: Aron Janecki <[email protected]>
Co-authored-by: Carlos Duarte <[email protected]>

_rules/aria-required-context-role-ff89c9.md

@@ -29,15 +29,15 @@ This rule applies to any HTML or SVG element that is [included in the accessibil
 
 ## Expectation
 
-Each test target is [owned by][] an element that has a [semantic role][] that is one of the [required context roles][] of the target element.
+Each test target is the child in the [accessibility tree][] of an element that has a [semantic role][] that is one of the [required context roles][] of the target element.
 
 ## Assumptions
 
 This rule assumes that the `role` attribute is used to give a [semantic role][] to the element according to ARIA specifications. If it is used for other purposes, and relationships between elements are already programmatically determinable by other means, it is possible to fail this rule but still satisfy [WCAG success criterion 1.3.1 Info and Relationships](https://www.w3.org/TR/WCAG21/#info-and-relationships).
 
 ## Accessibility Support
 
-- User agents do not all have the same accessibility tree. Particularly the method of deriving which element [owns][owned by] which other elements varies between browsers. This can lead to different results for this rule, depending on which accessibility tree is used as input.
+- User agents do not all have the same accessibility tree. This can lead to different results for this rule, depending on which accessibility tree is used as input.
 - `aria-owns` has limited support in some user agents.
 - There exist some combination of popular browsers and assistive technologies who do not announce correctly relationships based on a mix of [implicit][implicit role] and [explicit][explicit role] roles.
 
@@ -47,7 +47,9 @@ The applicability of this rule is limited to the [WAI-ARIA 1.1 Recommendation][a
 
 An example of an element that has an [implicit semantic role][] that is identical to its [explicit semantic role][] is a `<li role="listitem">` element. These elements are not applicable because they have extra requirements and should thus be checked separately.
 
-The definition of [owned by][] used in this rule is different from the definition of ["owned element" in WAI-ARIA](https://www.w3.org/TR/wai-aria-1.1/#dfn-owned-element). In this rule "owned by" includes only direct children of the owner element, whereas an "owned element" is any descendant of the owner.
+Being a child in the [accessibility tree][] is different from being a child in the DOM tree. Some DOM nodes have no corresponding node in the [accessibility tree][] (for example, because they are marked with `role="presentation"`). A child in the [accessibility tree][] can thus correspond to a descendant in the DOM tree. Additionally, the use of `aria-owns` attribute can change the tree structure to something which is not a subtree of the DOM tree.
+
+This rule is restricted to direct parent-child relation in the [accessibility tree][] which is more strict than the definition of ["owned element" in WAI-ARIA](https://www.w3.org/TR/wai-aria-1.1/#dfn-owned-element). This rule mimics, on the roles level, the [content model](https://html.spec.whatwg.org/#concept-element-content-model) of HTML.
 
 [Subclass roles][subclass role] of [required context roles][] are not automatically included as possible [required context roles][]. For example, the [`feed`](https://www.w3.org/TR/wai-aria-1.1/#feed) role is not a possible [required context role][] for [`listitem`](https://www.w3.org/TR/wai-aria-1.1/#listitem), even though [`feed`](https://www.w3.org/TR/wai-aria-1.1/#feed) is a [subclass role][] of the [`list`](https://www.w3.org/TR/wai-aria-1.1/#list) role.
 
@@ -62,7 +64,7 @@ Some user agents try to correct missing [required context roles][] or incorrect
 
 #### Passed Example 1
 
-These elements with an [explicit role][] of `listitem` are [owned by][] an element with their [required context role][], `list`, expressed as an [explicit role][].
+These elements with an [explicit role][] of `listitem` are children in the [accessibility tree][] of an element with their [required context role][], `list`, expressed as an [explicit role][].
 
 ```html
 <div role="list">
@@ -73,7 +75,7 @@ These elements with an [explicit role][] of `listitem` are [owned by][] an eleme
 
 #### Passed Example 2
 
-These elements with an [explicit role][] of `listitem` are [owned by][] an element with their [required context role][], `list`, expressed as an [implicit role][] of `ul`. Note that this test case does not satisfy [Success Criterion 4.1.1 Parsing][sc411] because the [`ul` element][ul] does not respect its [content model][].
+These elements with an [explicit role][] of `listitem` are children in the [accessibility tree][] of an element with their [required context role][], `list`, expressed as an [implicit role][] of `ul`. Note that this test case does not satisfy [Success Criterion 4.1.1 Parsing][sc411] because the [`ul` element][ul] does not respect its [content model][].
 
 ```html
 <ul>
@@ -84,7 +86,7 @@ These elements with an [explicit role][] of `listitem` are [owned by][] an eleme
 
 #### Passed Example 3
 
-These elements with an [explicit role][] of `listitem` are [owned by][] an element with their [required context role][] even though they are not direct DOM children of it. ARIA [ownership][owned by] "skips" through presentational nodes because they are not [included in the accessibility tree][].
+These elements with an [explicit role][] of `listitem` are children in the [accessibility tree][] of an element with their [required context role][] even though they are not its children in DOM. The presentational node is not [included in the accessibility tree][].
 
 ```html
 <div role="list">
@@ -97,7 +99,7 @@ These elements with an [explicit role][] of `listitem` are [owned by][] an eleme
 
 #### Passed Example 4
 
-These elements with an [explicit role][] of `listitem` are [owned by][] an element with their [required context role][] even though they are not DOM descendants of it. The `aria-owns` attribute is used to alter the accessibility tree and place the target elements in their [required context role](https://www.w3.org/TR/wai-aria-1.1/#scope).
+These elements with an [explicit role][] of `listitem` are children in the [accessibility tree][] of an element with their [required context role][] even though they are not its DOM descendants. The `aria-owns` attribute is used to alter the accessibility tree and place the target elements in their [required context role](https://www.w3.org/TR/wai-aria-1.1/#scope).
 
 ```html
 <div role="list" aria-owns="item1 item2"></div>
@@ -107,7 +109,7 @@ These elements with an [explicit role][] of `listitem` are [owned by][] an eleme
 
 #### Passed Example 5
 
-These elements with an [explicit role][] of `listitem` are [owned by][] an element with their [required context role][] even though they are not direct DOM descendants of it. The `aria-owns` attribute is used to alter the accessibility tree and place the target elements in their [required context role](https://www.w3.org/TR/wai-aria-1.1/#scope).
+These elements with an [explicit role][] of `listitem` are children in the [accessibility tree][] of an element with their [required context role][] even though they are not its DOM children. The `aria-owns` attribute is used to alter the accessibility tree and place the target elements in their [required context role](https://www.w3.org/TR/wai-aria-1.1/#scope).
 
 ```html
 <div role="list" aria-owns="item1 item2">
@@ -120,7 +122,7 @@ These elements with an [explicit role][] of `listitem` are [owned by][] an eleme
 
 #### Passed Example 6
 
-These elements with an [explicit role][] of `listitem` are [owned by][] an element with their [required context role][] because implicit [ownership][owned by] (inherited from DOM tree structure) crosses shadow boundaries.
+These elements with an [explicit role][] of `listitem` are children in the [accessibility tree][] of an element with their [required context role][] because the [accessibility tree][] mimics the DOM tree across shadow boundaries.
 
 ```html
 <div id="host" role="list"></div>
@@ -136,15 +138,15 @@ These elements with an [explicit role][] of `listitem` are [owned by][] an eleme
 
 #### Failed Example 1
 
-This element with an [explicit role][] of `listitem` is not [owned by][] an element with its [required context role][].
+This element with an [explicit role][] of `listitem` is not a child in the [accessibility tree][] of an element with its [required context role][].
 
 ```html
 <div role="listitem">List item 1</div>
 ```
 
 #### Failed Example 2
 
-These elements with an [explicit role][] of `listitem` are not [owned by][] an element with their [required context role][]. They are [owned by][] the `tabpanel` element, because it is the closest ancestor.
+These elements with an [explicit role][] of `listitem` are not children in the [accessibility tree][] of an element with their [required context role][], but of an element with the `tabpanel` role.
 
 ```html
 <div role="list">
@@ -157,7 +159,7 @@ These elements with an [explicit role][] of `listitem` are not [owned by][] an e
 
 #### Failed Example 3
 
-These elements with an [explicit role][] of `listitem` are not [owned by][] an element with their [required context role][]. They are instead [owned by][] the `div` with an `aria-label` attribute; even though this `div` has no role, it has a global ARIA attribute and is thus [included in the accessibility tree][].
+These elements with an [explicit role][] of `listitem` are not children in the [accessibility tree][] of an element with their [required context role][]. They are instead children in the [accessibility tree][] of the `div` with an `aria-label` attribute; even though this `div` has no role, it has a global ARIA attribute and is thus [included in the accessibility tree][].
 
 ```html
 <div role="list">
@@ -170,7 +172,7 @@ These elements with an [explicit role][] of `listitem` are not [owned by][] an e
 
 #### Failed Example 4
 
-These elements with an [explicit role][] of `listitem` are not [owned by][] an element with their [required context role][] because explicit [ownership][owned by] (set by `aria-owns`) does not cross shadow boundaries.
+These elements with an [explicit role][] of `listitem` are not children in the [accessibility tree][] of an element with their [required context role][] because explicit parent-child relation in the [accessibility tree][] (set by `aria-owns`) does not cross shadow boundaries.
 
 ```html
 <div role="list" aria-owns="item1 item2"></div>
@@ -233,6 +235,7 @@ There is no element with an [explicit role][] different from its [implicit role]
 </ul>
 ```
 
+[accessibility tree]: https://www.w3.org/TR/act-rules-aspects/#input-aspects-accessibility 'Definition of accessibility tree'
 [aria 1.1]: https://www.w3.org/TR/wai-aria-1.1/ 'WAI ARIA 1.1 specifications'
 [content model]: https://html.spec.whatwg.org/multipage/dom.html#concept-element-content-model 'HTML definition of the Content Model'
 [dpub 1.0]: https://www.w3.org/TR/dpub-aria-1.0/ 'Digital Publishing WAI-ARIA Module (DPUB ARIA) 1.0'
@@ -242,7 +245,6 @@ There is no element with an [explicit role][] different from its [implicit role]
 [implicit role]: #implicit-role 'Definition of Implicit Role'
 [implicit semantic role]: #implicit-role 'Definition of Implicit Role'
 [included in the accessibility tree]: #included-in-the-accessibility-tree 'Definition of Included in the Accessibility Tree'
-[owned by]: #owned-by 'Definition of Owned by'
 [required context role]: https://www.w3.org/TR/wai-aria-1.1/#scope 'WAI ARIA definition of Required Context Role'
 [required context roles]: https://www.w3.org/TR/wai-aria-1.1/#scope 'WAI ARIA definition of Required Context Role'
 [sc411]: https://www.w3.org/TR/WCAG21/#parsing 'Success Criterion 4.1.1 Parsing'