Accordion (expand/collapse)

Part of the JavaScript in Action section of Coddy's HTML journey — lesson 2 of 27.

An accordion is a UI component that lets you expand and collapse sections of content. It’s often used for FAQs (click a question → show the answer, click again → hide it).
The idea is simple: when you click a header, JavaScript toggles the visibility of the content below it.

Key points:

We have a button and a content element that is hidden by default (display: none).

Clicking the button triggers the function and passes the ID of the element that should open.

Inside the function:
- If the element is already showing (display: block), we hide it (display: none).
- Otherwise, we show it (display: block).

<button onclick="toggle('p1')">Question 1</button>
<div id="p1" style="display:none;">Answer 1</div>

<script>
  function toggle(id) {
    const element = document.getElementById(id);
    if (element.style.display === "block") {
      element.style.display = "none";
    } else {
      element.style.display = "block";
    }
  }
</script>

Challenge

Easy

Right now, our accordion has three questions. Your task is to add a fourth one.

Steps:

Create a new <button> with the text: Should I add milk or drink it black?
Link it to a new panel by calling the function onclick="togglePanel('q4')"
Create a <div> with the id="q4" and class panel.
Inside the div, write the answer:
It depends on your taste! Black coffee has stronger flavor, while milk softens the bitterness.

Try it yourself

<!DOCTYPE html>
<html>
<head>
  <title>FAQ Accordion</title>
  <link rel="stylesheet" href="style.css">
</head>
<body>

  <h1>FAQ Coffee Lovers</h1>

  <button class="accordion" onclick="togglePanel('q1')">What is the best way to brew coffee at home?</button>
  <div id="q1" class="panel">
    The French press and pour-over methods are popular for making rich, flavorful coffee at home.
  </div>

  <button class="accordion" onclick="togglePanel('q2')">Where do coffee beans come from?</button>
  <div id="q2" class="panel">
    Most coffee beans are grown in countries around the equator, such as Brazil, Ethiopia, and Colombia.
  </div>

  <button class="accordion" onclick="togglePanel('q3')">How late can I drink coffee?</button>
  <div id="q3" class="panel">
    It's best to avoid coffee 6 hours before bedtime, since caffeine can affect your sleep.
  </div>


  <script src="script.js"></script>
</body>
</html>