Discussion on: Let's build a responsive navbar and hamburger menu using HTML, CSS, and Javascript.

Thank you for sharing!
There's a way to do it without using JavaScript, handling the menu visibility with CSS.

If you add a <div> containing only the hamburger button and the menu, you can use the :focus-within CSS pseudo-selector. :focus-within applies to an element if it has the focus, but also if one of its children is focused.

For example, if you write the HTML for the menu like this:

<div class="menu-container">
  <button type="button" class="hamburger">Menu</button>
  <nav class="navbar">...</nav>
</div>

You can use the :focus-within selector like this:

.menu-container .navbar {
  display: none;
}
.menu-container:focus-within .navbar {
  display: block;
}

Now, the <nav class="navbar"> will initially remain hidden, but it will appear when any child of <div class="menu-container"> is focused. For example, when you click on the hamburger button or some of the menu items.