Difference between “click” and onclick

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The difference is that the first (click) is an event listener, and the second (onclick) is an event handler content attribute.

Event handler content attributes store an internal raw uncompiled handler, which produces an event listener via the event handler processing and getting the current value of the event handler algorithms.

In practice, this affects the scope, e.g.

(function() { var element = document.body;
  var str = "console.log([typeof foo, typeof bar])";
  var func = function() { console.log([typeof foo, typeof bar]); };
  element.foo = 'foo';
  var bar="bar";
  element.setAttribute('onclick', str);
  element.addEventListener('click', func);
  element.click();
  // Event handler content attribute logs ["string", "undefined"]
  // Event listener logs ["undefined", "string"]
})();

I discourage using event handlers. They are an old reminiscence and are superseded by event listeners.

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