doctype html
meta charset="utf-8"
p 複数Element と eventListener
.tgt style="top:20%"
.tgt style="top:70%"
css:
  div {
    width:300px;height:100px;
    position:absolute;background-color:yellow
  }
javascript:
  var es=document.getElementsByClassName('tgt')
  function x(msg){
    [].forEach.call(es,e=>e.textContent=msg)
    //should be...    es.foreach(e=>...)
  }
  document.addEventListener('click',ev=>x(`${ev.clientX},${ev.clientY}`),false)