E4X Browsers

The browser support for E4X is limited.

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Firefox

Firefox is currently the only browser with relatively good support for E4X.
In the next chapter there is a list of examples, describing some of the things you can do with E4x in Firefox.

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Opera, Chrome, and Safari

There are currently no support for E4X in Opera, Chrome, or Safari.

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Internet Explorer

So far there is no indication for of E4X support in Internet Explorer.
It looks like Microsoft is going to support its own alternative to AJAX.
AJAX is a new web development technique for creating interactive web applications using JavaScript, XML, and CSS.
You can read more about AJAX in our AJAX tutorial.