Type found by pbowyer.

index.html

@@ -273,7 +273,7 @@ <h2 id="downloads">
     <h2 id="Introduction">Introduction</h2>
 
     <p>
-      When working on a web application that involved a lot of JavaScript, one
+      When working on a web application that involves a lot of JavaScript, one
       of the first things you learn is to stop tying your data to the DOM. It's all
       too easy to create JavaScript applications that end up as tangled piles of
       jQuery selectors and callbacks, all trying frantically to keep data in