Google Sites Html Box

Experiments

The HTML Box will not allow all code, e.g. you cannot make calls to external JavaScript files, but you can use JavaScript embedded on the page.

The HTML box is not the answer to free-reign scripting. You can use more HTML, CSS, Javascript, and jQuery, but you cannot use all of it.

I did notice that the HTML box isn't an iframe like gadgets, so I think that creates room for interesting use of embedding code on your pages. I've had quite an interest in Google Analytics with Google Sites for event tracking.

For how to insert HTML box into your site, please see:
http://support.google.com/sites/bin/answer.py?hl=en&answer=2500646