"merge with master branch (release 0.4.1)"

README.md

@@ -20,6 +20,7 @@ It's an (un)fortunate coincidence that a Open/LibreOffice presentation tool is c
 VERSION HISTORY
 -----------------
 
+
 ### 0.5dev
 
 **CURRENTLY IN DEVELOPMENT**
@@ -35,6 +36,17 @@ VERSION HISTORY
     - `past` class is added to already visited steps (when the step is left)
 
 
+### 0.4.1 ([browse](http://github.com/bartaz/impress.js/tree/0.4.1), [zip](http://github.com/bartaz/impress.js/zipball/0.4.1), [tar](http://github.com/bartaz/impress.js/tarball/0.4.1))
+
+#### BUGFIX RELEASE
+
+Changes is version 0.4 introduced a bug causing JavaScript errors being thrown all over the place in fallback mode.
+This release fixes this issue.
+
+It also adds a flag `impress.supported` that can be used in JavaScript to check if impress.js is supported in the browser.
+
+
+
 ### 0.4 ([browse](http://github.com/bartaz/impress.js/tree/0.4), [zip](http://github.com/bartaz/impress.js/zipball/0.4), [tar](http://github.com/bartaz/impress.js/tarball/0.4))
 
 #### CHANGELOG

js/impress.js

@@ -140,7 +140,6 @@
     if (!impressSupported) {
         // we can't be sure that `classList` is supported
         body.className += " impress-not-supported ";
-        return;
     } else {
         body.classList.remove("impress-not-supported");
         body.classList.add("impress-supported");
@@ -171,6 +170,10 @@
     
     var impress = window.impress = function ( rootId ) {
         
+        if (!impressSupported) {
+            return null;
+        }
+        
         rootId = rootId || "impress";
         
         // if already initialized just return the API
@@ -471,6 +474,9 @@
         });
 
     };
+    
+    impress.supported = impressSupported;
+    
 })(document, window);
 
 // EVENTS
@@ -480,6 +486,11 @@
     
     var impress = window.impress;
     
+    // if impress is not supported don't add any handlers
+    if (!impress.supported) {
+        return;
+    }
+    
     // throttling function calls, by Remy Sharp
     // http://remysharp.com/2010/07/21/throttling-function-calls/
     var throttle = function (fn, delay) {