function _isElementFocusable(elem) {
		return elem.nodeType == 1
			&& _isElementVisible(elem)
			&& _elementHasTabIndex(elem);
	}
/**
	 * Determines if a DOM element is focusable.
	 */
Determines if a DOM element is focusable.
Determines if a DOM element is focusable .
function _isElementFocusable(elem) {
		return elem.nodeType == 1
			&& _isElementVisible(elem)
			&& _elementHasTabIndex(elem);
	}
function _isElementFocusable ( elem ) { return elem . nodeType == 1 && _isElementVisible ( elem ) && _elementHasTabIndex ( elem ) ; }
Determines if a DOM element is focusable.
Determines if a DOM element is focusable .