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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

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About the <head>

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Insecure Resource

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

All packages are different, so refer to their docs for how they work.

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HTML 

              
                <body>
  <!-- Header here -->
  <header>
    <nav class="
          flex flex-wrap
          items-center
          justify-between
          w-full
          py-4
          md:py-0
          px-4
          text-lg text-gray-700
          bg-white
        ">
      <div>
        <a href="#">
          Logo
        </a>
      </div>

      <svg xmlns="http://www.w3.org/2000/svg" id="menu-button" class="h-6 w-6 cursor-pointer md:hidden block" fill="none" viewBox="0 0 24 24" stroke="currentColor">
        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 6h16M4 12h16M4 18h16" />
      </svg>

      <div class="hidden w-full md:flex md:items-center md:w-auto" id="menu">
        <ul class="
              pt-4
              text-base text-gray-700
              md:flex
              md:justify-between 
              md:pt-0">
          <li>
            <a class="md:p-4 py-2 block hover:text-purple-400" href="#">Startsida</a>
          </li>
          <li>
            <a class="md:p-4 py-2 block hover:text-purple-400" href="#">Tidsbokning</a>
          </li>
          <li>
            <a class="md:p-4 py-2 block hover:text-purple-400" href="#">Kontrakt</a>
          </li>
          <li>
            <a class="md:p-4 py-2 block hover:text-purple-400" href="#">Kalender</a>
          </li>
          <li>
            <a class="md:p-4 py-2 block hover:text-purple-400" href="#">Dokument</a>
          </li>
          <li>
            <a class="md:p-4 py-2 block hover:text-purple-400" href="#">Mina sidor</a>
          </li>
          </li>
        </ul>
      </div>
    </nav>
  </header>

  <!-- Sidebar -->
  <aside>
    <div class="w-60 h-full shadow-md bg-white px-1 absolute">
      <ul class="relative">
        <li class="relative">
          <a class="flex items-center text-sm py-4 px-6 h-12 overflow-hidden text-gray-700 text-ellipsis whitespace-nowrap rounded hover:text-gray-900 hover:bg-green-100 transition duration-300 ease-in-out" href="#!">Startsida</a>
        </li>
        <li class="relative">
          <a class="flex items-center text-sm py-4 px-6 h-12 overflow-hidden text-gray-700 text-ellipsis whitespace-nowrap rounded hover:text-gray-900 hover:bg-green-100 transition duration-300 ease-in-out" href="#!">Tidsbokning</a>
        </li>
        <li class="relative">
          <a class="flex items-center text-sm py-4 px-6 h-12 overflow-hidden text-gray-700 text-ellipsis whitespace-nowrap rounded hover:text-gray-900 hover:bg-green-100 transition duration-300 ease-in-out" href="#!">Kontrakt</a>
        </li>
        <li class="relative">
          <a class="flex items-center text-sm py-4 px-6 h-12 overflow-hidden text-gray-700 text-ellipsis whitespace-nowrap rounded hover:text-gray-900 hover:bg-green-100 transition duration-300 ease-in-out" href="#!">Kalender</a>
        </li>
        <li class="relative">
          <a class="flex items-center text-sm py-4 px-6 h-12 overflow-hidden text-gray-700 text-ellipsis whitespace-nowrap rounded hover:text-gray-900 hover:bg-green-100 transition duration-300 ease-in-out" href="#!">Dokument</a>
        </li>
        <li class="relative">
          <a class="flex items-center text-sm py-4 px-6 h-12 overflow-hidden text-gray-700 text-ellipsis whitespace-nowrap rounded hover:text-gray-900 hover:bg-green-100 transition duration-300 ease-in-out" href="#!">Mina sidor</a>
        </li>
      </ul>
    </div>
  </aside>
  <div class="px-4">
    <div class="
          flex
          justify-center
          items-center
          bg-white
          mx-auto
          max-w-2xl
          rounded-lg
          my-16
          p-16
        ">
      <h1 class="text-2xl font-medium">Navbar</h1>
    </div>
  </div>
</body>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css2?family=Noto+Emoji&display=swap');

.emoji {
  font-family: 'Noto Emoji', sans-serif;
 }
!

JS 

              
                const button = document.querySelector('#menu-button');
const menu = document.querySelector('#menu');


button.addEventListener('click', () => {
  menu.classList.toggle('hidden');
});
!
999px

Console