tracer says to #ysitd
d=c||document,e=null;return(e=d.getElementsByClassName?d.getElementsByClassName(a)[0]:k.dom.canUseQuerySelector_(d)?d.querySelector("."+a):k.dom.getElementsByTagNameAndClass_(document,"*",a,c)[0])||null};k.dom.getRequiredElementByClass=function(a,c){var d=k.dom.getElementByClass(a,c);return k.asserts.assert(d,"No element found with className: