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.
The National Institute of Standards and Technology (NIST) operates under the authority of the National Institute of Standards and Technology Act (15 U.S.C. 271), which amends the Organic Act of March 3, 1901 (ch. 872), that created the National Bureau of Standards (NBS) in 1901. In 1988, Congress renamed NBS as NIST and expanded its activities and responsibilities.