Add anchor functionality.

index.html

@@ -54,7 +54,7 @@ <h3>Okay, so how do I use this thing?<a href="#caveat">*</a></h3>
       </li>
       <li>Bulletproof your font-stacks and <strong>rejoice</strong>!</li>
     </ol>
-    <aside class="caveat">
+    <aside id="caveat">
       <p><strong>*</strong> Small caveat: this bookmarklet only works on webkit browsers (Chrome &amp; Safari) or Firefox. We might get it working for IE and Opera if time permits. But I wouldn't hold your breath.</p>
     </aside>
     <p>For more background on how this came to be and why it's important, read <a href="https://blog.typekit.com/2011/03/24/type-study-choosing-fallback-fonts/">Type study: Choosing fallback fonts</a>.</p>