Find all event handlers

/* jQuery way */
$('*')
  .filter(function(){
    return !!$._data( this, 'events');
  })
  .get()
  .reduce(function(dict, el){
    dict[el.className] = Object.keys($._data( el, 'events')).sort().join(', ')
    return dict;
  }, {});
  
/* Developer tools way  */
Array
  .from(document.querySelectorAll('*'))
  .filter(el => !!Object.keys(getEventListeners(el)).length)
  .sort()
  .reduce(function(dict, el) {
    /* SVG className is an object, so we have to use getAttribute*/
    const classAttr = el.getAttribute('class');
    const className = classAttr ? '.' + classAttr.replace(/ /g, '.') : '';
    dict[el.tagName + className] = Object.keys(getEventListeners(el)).sort().join(', ');
    return dict;
  }, {});