6cfa84: Modify pass example 4 to be more realistic, using a dialog

_rules/aria-hidden-no-focusable-content-6cfa84.md

@@ -100,10 +100,21 @@ This `input` element is not [focusable][] because of the `disabled` attribute.
 This `a` element is not [focusable][] because it moves focus to the `input` element whenever it receives focus.
 
 ```html
+<div id="sampleModal" role="dialog" aria-label="Sample Modal" aria-modal="true" style="border: solid black 1px; padding: 1rem;">
+    <label>Some input <input id="dialogFirst"></label><br />
+    <button id="closeButton">Close button</button>
+</div>
 <div aria-hidden="true">
-	<a href="/" style="position:absolute; top:-999em" onfocus="document.querySelector('input').focus()">First link</a>
+    <a href="#" id="sentinelAfter" style="position:absolute; top:-999em">Focus sentinel</a>
 </div>
-<input />
+<script>
+    document.getElementById("sentinelAfter").addEventListener("focus", () => {
+        document.getElementById("dialogFirst").focus();
+    });
+    document.getElementById("sampleModal").addEventListener("click", () => {
+        document.getElementById("sampleModal").style.display = "none";
+    });
+</script>
 ```
 
 ### Failed
@@ -169,6 +180,25 @@ This `summary` element is [focusable][].
 </details>
 ```
 
+#### Failed Example 7
+
+This `a` element is [focusable][] because it fails to move focus when it receives focus. This is in contrast to Passed Example 4.
+
+```html
+<div id="sampleModal" role="dialog" aria-label="Sample Modal" aria-modal="true" style="border: solid black 1px; padding: 1rem;">
+    <label>Some input <input id="dialogFirst"></label><br />
+    <button id="closeButton">Close button</button>
+</div>
+<div aria-hidden="true">
+    <a href="#" id="sentinelAfter" style="position:absolute; top:-999em">Focus sentinel</a>
+</div>
+<script>
+    document.getElementById("sampleModal").addEventListener("click", () => {
+        document.getElementById("sampleModal").style.display = "none";
+    });
+</script>
+```
+
 ### Inapplicable
 
 #### Inapplicable Example 1