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HTML

              
                <h1>The difference between <code>event.stopPropagation()</code> and <code>event.stopImmediatePropagation()</code></h1>

<p>If you click on the <code>button</code> element, the <code>"I'm a div"</code> alert <strong>WILL NOT</strong> show. It will only show if you click <em>elsewhere</em> inside the purple area. Both methods behave the same in this respect.</p>

<p>However...</p>

<ul>
  <li>With the <code>stopPropagation()</code> method, the <code>"I'm a button!"</code> alert <strong>WILL</strong> show.</li>
  <li>With the <code>stopImmediatePropagation()</code> method, the <code>"I'm a button!"</code> alert <strong>WILL NOT</strong> show.</li>
</ul>

<p>Try swapping them in the JavaScript editor to see what happens. For more information, check out my blog post:</p>

<p>
  <a href="https://kbarker.dev/2020/07/28/the-difference-between-event-stop-propagation-and-event-stop-immediate-propagation">The difference between <code>event.stopPropagation()</code> and <code>event.stopImmediatePropagation()</code></a>
</p>

<div>
  <button type="button">Click Me!</button>
</div>
              
            
!

CSS

              
                :root {
  font-size: 16px;
}

body {
  width: 88%;
  max-width: 34em;
  margin: 1em auto;
  font: 1em/1.5 Arial, sans-serif;
}

code {
  color: #d14;
}

li + li {
  margin-top: 1em;
}

a {
  color: #0277bd;
}

a:hover {
  text-decoration: none;
}

a code {
  color: inherit;
}

div {
  padding: 1em;
  background-color: #639;
}

button {
  font: inherit;
}
              
            
!

JS

              
                var div = document.querySelector("div");
var button = div.querySelector("button");

// This WILL NOT run when the button is clicked
div.addEventListener("click", function () {
  alert("I'm a div!");
});

button.addEventListener("click", function (event) {

  // Try changing which line is commented to see what happens! 👇

  // With this line, the "I'm a button!" alert WILL show
  event.stopPropagation();

  // With this line, the "I'm a button!" alert WILL NOT show
  // event.stopImmediatePropagation();

});

// This WILL NOT run when the button is clicked
button.addEventListener("click", function () {
  alert("I'm a button!");
});

// Learn more:
// https://kbarker.dev/2020/07/28/the-difference-between-event-stop-propagation-and-event-stop-immediate-propagation
              
            
!
999px

Console