Clarify standards mode requirement for IE

index.html

@@ -195,8 +195,11 @@ <h2 id="supported">Supported browsers</h2>
     <li>Firefox 2 or higher</li>
     <li>Chrome, any version</li>
     <li>Safari 3 or higher</li>
-    <li>Internet Explorer 7 or higher in standards (<strong>non-quirks</strong>) mode</li>
     <li>Opera 9 or higher (with some key-handling problems on OS X)</li>
+    <li>Internet Explorer 7 or higher in standards mode<br>
+      <em>(So not quirks mode. But quasi-standards mode with a
+      provisional doctype is also flaky. <code>&lt;!doctype
+      html></code> is recommended.)</em></li>
   </ul>
 
   <p>I am not actively testing against every new browser release, and