allow attaching a handler for an event that is defined in an element other than the one adding the handler. code example

Example 1: javascript click event

<button onclick="myFunction()">Click me</button>

<p id="demo"></p>

<script>
function myFunction() {
  document.getElementById("demo").innerHTML = "Hello World";
}
</script>

Example 2: javascript event listener

element.addEventListener("click", function(){ 
   element.innerText = "something"; 
});

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