HTML5 data-attributes in iframe element

Question

Can custom data-attributes set on an iframe be accessed by the iframe's content?

Example:

<iframe src="foo.html" data-something="123"></iframe>

Is there a way to access data-something's value form the iframe's document?

Thanks.

Solution

Yes, use the frameElement attribute.

window.frameElement.getAttribute('data-something');

Demo: http://jsfiddle.net/Ehj2Q/

Of course this does not work at all if the iframe's content are from a different origin.