Get page load time

load.html

  <div id="test"><s><span id="time"></span></s> to display <s><span id="num"></span></s> elements</div>

load.js

var beforeload = (new Date()).getTime();
function getLoadTime(){
  var afterload = (new Date()).getTime();
  seconds = (afterload-beforeload) / 1000;
  var n = document.getElementById('num');
  var a = document.getElementById('acc');
  var s = document.getElementById('time');
  var loadTime = window.performance.timing.domContentLoadedEventEnd-window.performance.timing.navigationStart; 

  n.innerHTML = document.querySelectorAll('selector').length;
  
  if (Math.floor(seconds)>=1){
      s.innerHTML = Math.floor(seconds) + 'seconds';
  } else {
      s.innerHTML = seconds + 'miliseconds';
  }
}