How to access custom attributes from event object in React?

Question

React is able to render custom attributes as described at http://facebook.github.io/react/docs/jsx-gotchas.html:

If you want to use a custom attribut

Answer 1

If anyone is trying to use event.target in React and finding a null value, it is because a SyntheticEvent has replaced the event.target. The SyntheticEvent now holds 'currentTarget', such as in event.currentTarget.getAttribute('data-username').

https://facebook.github.io/react/docs/events.html

It looks like React does this so that it works across more browsers. You can access the old properties through a nativeEvent attribute.