Reaction time sens clicker

file.js

var ele = document.querySelector('.test-standard.reaction-time-test');
var config = { attributes: true };

var event = new MouseEvent('mousedown', {
  bubbles: true,
  cancelable: true
});

var callback = function (mutationsList, observer) {
  for (var mutation of mutationsList) {
    if (mutation.type == 'attributes' && mutation.attributeName == 'class' && ele.classList.contains('view-go')) {
      console.log('clicked')
      ele.dispatchEvent(event);
    }
  }
};

var observer = new MutationObserver(callback);



observer.observe(ele, config);