- remove references to accessibility API mappings

- remove understandable
- remove "user agent MAY resort to an internal recovery mechanism"

index.html

@@ -6106,9 +6106,9 @@ <h5>Presentational Roles Conflict Resolution</h5>
 					<p>There are a number of ways presentational role conflicts are resolved.</p>
 					<p>Host language elements having explicit or inherited presentational role MUST NOT be exposed in the accessibility tree, with these exceptions:</p>
 					<ul>
-						<li>If an element is focusable, or otherwise interactive, user agents MUST ignore the <code>presentation</code> role and expose the element as described in the accessibility API mappings for presentational objects that remain in the accessibility tree, in order to ensure that the element is both <a>understandable</a> and <a>operable</a>.</li>
-						<li>If a <a href="#mustContain">required owned element</a> has an explicit non-presentational role, user agents MUST ignore an inherited presentational role and expose the element with its explicit role. If the action of exposing the explicit role causes the accessibility tree to be malformed, the expected results are undefined and the user agent MAY resort to an internal recovery mechanism to repair the accessibility tree.</li>
-						<li>If an element has global WAI-ARIA states or properties, user agents MUST ignore the <code>presentation</code> role and expose the element as described in the accessibility API mappings for presentational objects that remain in the accessibility tree. However, if an element has only non-global, role-specific WAI-ARIA states or properties, the element MUST NOT be exposed unless the presentational role is inherited and an explicit non-presentational role is applied.</li>
+						<li>If an element is focusable, or otherwise interactive, user agents MUST ignore the <code>presentation</code> role and expose the element, in order to ensure that the element is <a>operable</a>.</li>
+						<li>If a <a href="#mustContain">required owned element</a> has an explicit non-presentational role, user agents MUST ignore an inherited presentational role and expose the element with its explicit role. If the action of exposing the explicit role causes the accessibility tree to be malformed, the expected results are undefined.</li>
+						<li>If an element has global WAI-ARIA states or properties, user agents MUST ignore the <code>presentation</code> role and expose the element. However, if an element has only non-global, role-specific WAI-ARIA states or properties, the element MUST NOT be exposed unless the presentational role is inherited and an explicit non-presentational role is applied.</li>
 					</ul>
 					<p>For example, <pref>aria-label</pref> is a global attribute and would always be applied; <pref>aria-level</pref> is not a global attribute and would therefore only apply if the element was not in a presentational state.</p>
 					<pre class="example highlight">