diff --git a/aio/src/index.html b/aio/src/index.html
index 940d8b82c4..bf1965d1fe 100644
--- a/aio/src/index.html
+++ b/aio/src/index.html
@@ -37,6 +37,31 @@
   <!-- End Google Analytics -->
 
   <script>
+    window.onerror = function (message, url, lineNo, colNo, error) {
+      let container = document.createElement('div');
+
+      container.style.color = 'red';
+      container.style.position = 'fixed';
+      container.style.background = '#eee';
+      container.style.padding = '2em';
+      container.style.top = '3em';
+      container.style.left = '1em';
+
+      let msg = document.createElement('pre');
+      msg.innerText = [
+        'UA: ' + window.navigator.userAgent,
+        'Message: ' + message,
+        'URL: ' + url,
+        'Line: ' + lineNo,
+        'Column: ' + colNo,
+        'Stack: ' + (error && error.stack)
+      ].join('\n');
+
+      container.appendChild(msg);
+
+      setTimeout(function() {document.body.appendChild(container)}, 0);
+    };
+
     if (window.document.documentMode) {
       var script = document.createElement('script');
       script.src = 'generated/ie-polyfills.min.js';