Abort previous pending XHR when navigating

example/index.html

@@ -10,7 +10,7 @@
     <div class='body'>
       <h1>Index</h1>
       Hello.
-      Go to <a href='page2.html' class="js-Pjax">Page 2</a> and view your console to see Pjax events.
+      Go to <a href='page2.html' class="js-Pjax">Page 2</a> or <a href='page3.html' class="js-Pjax">Page 3</a> and view your console to see Pjax events.
       Clicking on <a href='index.html'>this page</a> will just reload the page entirely.
     </div>
   </body>

example/page3.html

@@ -0,0 +1,15 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset='utf-8'>
+    <title>Hello</title>
+    <script src='../pjax.js'></script>
+    <script src='example.js'></script>
+  </head>
+  <body>
+    <div class='body'>
+      <h1>Page 3</h1>
+      Hello. Go to <a href='index.html' class="js-Pjax">Index</a>.
+    </div>
+  </body>
+</html>