--- title: "React v0.4.1" author: [zpao] --- 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!](/downloads.html)