Update summary-allowances.html

Author: scottaohara

tests/summary-allowances.html

@@ -107,6 +107,32 @@ <h3>Test 2</h3>
 	      </p>
 
       </div>
+			
+			<div class="widgetDemo">
+				<h3>Test 3</h3>
+				<p>Authors can use <code>aria-disabled</code> or <code>aria-haspopup</code> 
+          attributes on a <code>summary</code> element when it serves as the summary for its parent details element.</p>
+
+				<div class="testcase">
+					<p>Using an aria-disabled attribute is allowed</p>
+          <details open>
+            <summary aria-disabled=true>test 1</summary>
+            has aria-disabled=true attribute
+          </details>
+				</div>
+        
+        <div class="testcase">
+					<p>AUsing an aria-haspopup attribute is allowed</p>
+          <details open>
+            <summary aria-haspopup=true>test 2</summary>
+            has aria-haspopup=true attribute
+          </details>
+				</div>
+
+				<p><strong>Expected result:</strong>
+				<br>The aria-disabled and aria-haspopup attributes both have good support and are valid to use on the summary element when it acts as the interactive trigger for the details/summary disclosure widget. Other checks may be necessary to ensure that developers are using these attributes correctly, but that is beyond the scope of what ARIA in HTML covers.</p>
+			</div>
+			
 		</div>
 	</main>
 </body>