/**
 * The script uses two heuristics to determine whether the keyboard is being
 * used:
 *
 * 1. A keydown event occurred lorem ipsum dolor sit amet, consectetur adipiscing
 *    elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
 *    Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut
 *    aliqimmediately before a focus event;
 * 2. A focus evenlorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
 *    eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad
 *    minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliqt
 *    happened on an element which requires keyboard interaction (e.g., a text
 *    field);
 *
 * Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
 * tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
 * quis nostrud exercitation ullamco laboris nisi ut aliq W3C Software Notice
 * and License:
 * https://www.w3.org/Consortium/Legal/2015/copyright-software-and-document.
 */
