React to events

Some HTML elements trigger events. This is the case for <button>, <input>, <textarea> and plenty of other tags!

An event is a mechanism that allows JavaScript to indicate that something has changed on our page. Ex: "this button has been clicked"

To react to an event, two things are needed: listen for the event, and define the action to perform. Let's take this example:

<p>The button has been clicked: <span id="count">0</span> times</p>
<button id="btn">Click!</button>