- split intro sentence into 2 sentences

- add note saying authors should not use in content
- add editor's note about global properties triage

index.html

@@ -2945,8 +2945,11 @@ <h2>Definition of Roles</h2>
 		<div class="role" id="generic">
 			<rdef>generic</rdef>
 			<div class="role-description">
-				<p>A nameless container <a>element</a> that has no semantic meaning on its own, but can provide accessible states and properties for its descendants.</p>
+				<p>A nameless container <a>element</a> that has no semantic meaning on its own.</p>
 				<p>Contrast with <rref>group</rref>, which semantically groups its descendants in a named container.</p>
+				<p>A <code>generic</code> can provide a limited number of accessible states and properties for its descendants, such as <sref>aria-hidden</sref> and <pref>aria-live</pref>.</p>
+				<p class="note"><code>generic</code> is a superclass role used for the ontology. With the exception of providing <code>generic</code> <a href="https://html.spec.whatwg.org/multipage/custom-elements.html">Custom Elements</a>, authors should not use this role in content.</p>
+				<p class="ednote">A triage of global properties is pending. This will reduce the number of inherited states and properties in the characteristics table below. For details, see <a href="https://github.com/w3c/aria/issues/999">issue #999</a>.</p>
 			</div>
 			<table class="role-features">
 				<caption>Characteristics:</caption>