Add link back to codepen

tests/live-regions/index.html

@@ -17,6 +17,8 @@ <h1>ARIA live region tests</h1>
 <p>Note that <code>role="alert"</code> is slightly "magic" and triggers an announcement even in cases where you generally don't expect it - see <a href="https://github.com/w3c/aria/issues/2153" target=_blank>w3c/aria/issues/2153</a>.</p>
 <p>Does <em>not</em> include <code>role="marquee"</code> and <code>role="timer"</code> at this stage, as they have an intrinsic <code>aria-live="off"</code> and will require a different type of test - see <a href="https://github.com/w3c/aria/issues/2144" target=_blank>w3c/aria/issues/2144</a>.</p>
 
+<p><small>Ported over from <a href="https://codepen.io/patrickhlauke/pen/zYbgvdL">codepen</a></small>
+
 <h2>Already present on page load</h2>
 
 <p>Load/reload codepen to verify if any of these get announced on page load.</p>