Data export keyboard focus is wrong in IE 10

[waldoj]

In Internet Explorer 10, upon visiting the site, if the visitor types in e.g. TX in the search field and then hits Enter, the search is submitted and the Here's how you know link in the U.S. Government header is unfurled. The effect of this is that the top half of the browser becomes full of text about how to know when a site is a government site, and the site content moves down to the bottom half.

Because the visitor was not expecting this, she both has to figure out what happened, and then identify that the Here's how you know text is the link that will eliminate this big, blue box.

It looks like the Enter is bound to search submission, even though the tab-based-navigation functionality for the page has that top link already selected.

I suspect that the solution here is to move the focused element to the text input field, when the visitor interacts with it, instead of leaving it at the initial link at the top of the browser. But this gets a bit tricky around accessibility, so I'm not sure of that at all.