The site navigation utilizes arrow, enter, escape, and space bar key commands. Left and right arrows move across top level links and expand / close menus in sub levels. Up and Down arrows will open main level menus and toggle through sub tier links. Enter and space open menus and escape closes them as well. Tab will move on to the next part of the site rather than go through menu items.
REVENUE ESTIMATES RELATING TO THE HOUSE, SENATE, AND CONFERENCE (ENACTED) VERSIONS OF H.R. 13270: TAX REFORM ACT OF 1969, PUBLIC LAW 91-172
PROPOSED INCOME TAX CONVENTION BETWEEN THE UNITED STATES AND BELGIUM