make menuitemradio subclass menuitem, require aria-checked (#1354)

index.html

@@ -5671,7 +5671,7 @@ <h4>Plain HTML or Polyfill DOM Result of the MathML Quadratic Formula</h4>
 					</tr>
 					<tr>
 						<th class="role-related-head" scope="row">Related Concepts:</th>
-						<td class="role-related"><rref>menuitem</rref></td>
+						<td class="role-related"><rref>menuitemradio</rref></td>
 					</tr>
 					<tr>
 						<th class="role-scope-head" scope="row">Required Context Role:</th>
@@ -5757,7 +5757,7 @@ <h4>Plain HTML or Polyfill DOM Result of the MathML Quadratic Formula</h4>
 						<th class="role-parent-head" scope="row">Superclass Role:</th>
 						<td class="role-parent">
 							<ul>
-								<li><rref>menuitemcheckbox</rref></li>
+								<li><rref>menuitem</rref></li>
 							</ul>
 						</td>
 					</tr>
@@ -5771,7 +5771,7 @@ <h4>Plain HTML or Polyfill DOM Result of the MathML Quadratic Formula</h4>
 					</tr>
 					<tr>
 						<th class="role-related-head" scope="row">Related Concepts:</th>
-						<td class="role-related"><rref>menuitem</rref></td>
+						<td class="role-related"><rref>menuitemcheckbox</rref></td>
 					</tr>
 					<tr>
 						<th class="role-scope-head" scope="row">Required Context Role:</th>
@@ -5787,6 +5787,14 @@ <h4>Plain HTML or Polyfill DOM Result of the MathML Quadratic Formula</h4>
 						<th class="role-mustcontain-head" scope="row">Required Owned Elements:</th>
 						<td class="role-mustcontain"> </td>
 					</tr>
+					<tr>
+						<th class="role-required-properties-head">Required States and Properties:</th>
+						<td class="role-required-properties">
+							<ul>
+								<li><sref>aria-checked</sref></li>
+							</ul>
+						</td>
+					</tr>
 					<tr>
 						<th scope="row">Supported States and Properties:</th>
 						<td class="role-properties"> </td>