Blog post for v0.4.1

_posts/2013-07-26-react-v0-4-1.md

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+---
+title: "React v0.4.1"
+layout: post
+author: Paul O'Shannessy
+---
+
+React v0.4.1 is a small update, mostly containing correctness fixes. Some code has been restructured internally but those changes do not impact any of our public APIs.
+
+
+## React
+
+* `setState` callbacks are now executed in the scope of your component.
+* `click` events now work on Mobile Safari.
+* Prevent a potential error in event handling if `Object.prototype` is extended.
+* Don't set DOM attributes to the string `"undefined"` on update when previously defined.
+* Improved support for `<iframe>` attributes.
+* Added checksums to detect and correct cases where server-side rendering markup mismatches what React expects client-side.
+
+
+## JSXTransformer
+
+* Improved environment detection so it can be run in a non-browser environment.
+
+
+[Download it now!](/react/downloads.html)