How would you implement a responsive navigation menu using HTML, CSS, and JavaScript?

@shaun.will 

To answer the interview question on implementing a responsive navigation menu using HTML, CSS, and JavaScript, you can follow the steps below:

1. HTML Markup: Create a HTML structure for the navigation menu. You can use an unordered list (ul) and list items (li) for this. Give each list item a unique class or ID.
2. CSS Styling: Write CSS code to style the navigation menu. Use media queries to set different styles for different screen sizes. Use CSS Flexbox or Grid to create a responsive layout. Use CSS transitions and animations to add interactivity to the menu.
3. JavaScript: Write JavaScript code to add interactivity to the navigation menu. Use event listeners to listen for clicks on the menu icon or menu items. Use JavaScript functions to toggle the visibility of the menu and to add or remove classes for styling purposes.

Here's an example code snippet that implements a responsive navigation menu:

HTML:

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<nav>
  <div class="menu-icon">
    <span></span>
    <span></span>
    <span></span>
  </div>
  <ul class="menu">
    <li><a href="#">Home</a></li>
    <li><a href="#">About</a></li>
    <li><a href="#">Services</a></li>
    <li><a href="#">Contact</a></li>
  </ul>
</nav>

CSS:

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nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  background-color: #333;
  color: #fff;
}

.menu-icon {
  display: none;
  cursor: pointer;
}

.menu-icon span {
  display: block;
  width: 30px;
  height: 5px;
  margin-bottom: 5px;
  background-color: #fff;
  border-radius: 3px;
}

@media screen and (max-width: 768px) {
  .menu {
    display: none;
    flex-direction: column;
    align-items: center;
    margin-top: 20px;
  }

  .menu li {
    margin: 10px 0;
  }

  .menu-icon {
    display: block;
  }
}

JavaScript:

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const menuIcon = document.querySelector('.menu-icon');
const menu = document.querySelector('.menu');

menuIcon.addEventListener('click', () => {
  menu.classList.toggle('show');
});

In the above code snippet, the CSS code sets the styles for the navigation menu, and the media query adjusts the styles for different screen sizes. The JavaScript code adds an event listener to the menu icon, and toggles the visibility of the menu when the icon is clicked. The 'show' class is added to the menu element to display it when it's toggled.