[examples] more docs in the accessible-panel example

examples/accessible-panel.html

@@ -97,7 +97,7 @@
 
     <div id="docs">
 
-      <p>Accessibility:
+      <p>An accessible panel:
 
       <ul>
       <li>The buttons are actual HTML buttons. You can therefore
@@ -118,6 +118,12 @@
           href="accessible-panel.js" target="_blank"> accessible-panel.js
           source</a> to see how this is done.</p>
 
+      <p>Note: in IE 8, when a button is pressed its content shifts by 1 pixel.
+      This is a <a
+          href="http://labs.findsubstance.com/2009/05/21/ie8-form-button-with-background-image-on-click-css-bug/">known
+          IE8 bug</a>, with known workarounds. No workaround is applied in this
+      example though.</p>
+
     </div>
 
   </body>