code: function removeTabbable(oBlockSpan, fnRedirectFocus) {
  			if (oBlockSpan.parentNode) {
  				oBlockSpan.parentNode.removeChild(oBlockSpan);
  			}
  			oBlockSpan.removeEventListener('focusin', fnRedirectFocus);
  		}
docs: Create a tabbable span for the block section of the control with according focus handling.
  
  @param {function} fnRedirectFocus Focus handling function
  @returns {object} The span element's DOM node
  @private