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Blog post for v0.4.1

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Paul O’Shannessy 2013-07-26 15:56:52 -07:00
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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)