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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

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

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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

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

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Babel includes JSX processing.

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HTML 

              
                <button
      popuptoggletarget="drawer"
      class="nav-control"
      aria-haspopup="true"
      aria-expanded="false"
      aria-controls="nav"
      aria-pressed="true"
    >
      <span>Menu Collapsed</span><span>Menu Expanded</span
      ><svg class="nav__icon" viewBox="0 0 24 24" role="img">
        <title>Menu icon</title>
        <path
          d="M3,6H21V8H3V6M3,11H21V13H3V11M3,16H21V18H3V16Z"
          fill="var(--color)"
        ></path>
        <path
          d="M3,6H21V8H3V6M3,11H21V13H3V11M3,16H21V18H3V16Z"
          fill="var(--color)"
        ></path>
      </svg>
    </button>
    <nav class="menu" id="drawer" popup>
      <ul>
        <li>Home</li>
        <li>About</li>
        <li>Writing</li>
      </ul>
    </nav>
    <header>
      <h1>Some Awesome Site</h1>
    </header>
    <main>
      <p>
        Lorem ipsum dolor sit amet consectetur adipisicing elit. Recusandae
        voluptatibus non aut cum eos optio inventore alias velit exercitationem
        sit placeat vel magnam maxime illo ratione fuga, nobis, quibusdam
        officia!
      </p>
      <p>
        Optio ea dolorem qui, necessitatibus, similique cupiditate. Animi fuga
        exercitationem hic aperiam corrupti minus sunt inventore dignissimos
        laborum non, sequi eligendi libero quas totam doloribus officia ipsum,
        nihil placeat rem.
      </p>
      <p>
        Praesentium laboriosam cumque natus adipisci amet asperiores mollitia
        sit consequatur, excepturi deleniti dolores, vitae. Tenetur inventore
        officia, iusto illo, vitae sit fugit vero consequatur molestias, atque
        nulla, eaque aliquam sapiente.
      </p>
      <p>
        Quam necessitatibus aut sit, nesciunt doloribus? Reprehenderit, illum?
        Velit distinctio non adipisci modi libero nostrum placeat fuga dolorem,
        eveniet, ab praesentium nemo, amet. Dolores porro blanditiis doloribus
        perferendis praesentium impedit.
      </p>
      <p>
        Dolores ratione quaerat veniam placeat aut quidem blanditiis nisi
        ducimus distinctio soluta ut, inventore nobis ex dolorem modi
        accusantium architecto vero, voluptas! Cupiditate porro maxime eius,
        suscipit esse sit, rerum.
      </p>
    </main>
!

CSS 

              
                :root {
  --open: 0;
  --bg: var(--gray-9);
  --text-1: var(--gray-1);
  --text-2: var(--gray-1);
  --color: var(--gray-1);
  --header-gradient: var(--gradient-1);
  --hover-action: var(--gray-7);
  --nav-color: var(--gray-8);
  --link: var(--red-3);
}

[aria-pressed] {
  background: none;
  border-radius: 50%;
  position: fixed;
  top: 1rem;
  right: 1rem;
}

[aria-pressed]:hover {
  background: var(--hover-action);
}

body {
  background: var(--bg);
  display: grid;
  color: var(--color);
  align-items: start;
  justify-items: center;
  min-height: 100vh;
  grid-auto-rows: min-content;
  overflow-x: hidden;
}

nav {
  padding: var(--size-2) 0;
  background: var(--nav-color);
  position: fixed;
  top: 0;
  width: 200px;
  bottom: 0;
  box-shadow: var(--inner-shadow-4);
  left: calc(100% - 200px);
  height: 100vh;
  color: var(--gray-0);
}

[popup] {
	--x: 100;
	--speed: 200ms;
  transition: transform var(--speed);
	transform: translateX(calc(var(--x) * 1%));
}

[popup]:top-layer {
  --x: 0;
}

nav::backdrop {
  background: hsl(0 0% 15% / 0.2);
  backdrop-filter: blur(4px);
  animation: fade-in 0.25s ease-in;
}

@keyframes fade-in {
  from {
    opacity: 0;
  }
}

header {
  padding: var(--size-12) 0;
  background: var(--header-gradient);
  width: 100%;
  display: grid;
  place-items: center;
}

:where(h1) {
  text-align: center;
  width: 100%;
  font-size: var(--font-size-6);
}

:where(p, ul) {
  font-size: var(--font-size-0);
  max-inline-size: var(--size-content-2);
}

nav ul {
  list-style-type: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  max-width: 100%;
  padding: 0;
  margin: 0;
  width: var(--size-xl);
  gap: var(--size-4);
}

ul li:hover {
  text-decoration: underline var(--size-1) var(--color);
}

button {
  height: 48px;
  position: relative;
  aspect-ratio: 1;
  overflow: hidden;
  padding: 0;
}

button span {
  position: absolute;
  inset: 0;
  opacity: 0;
  color: transparent;
}

p {
  margin-top: var(--size-4);
}

[aria-pressed] :is(span, svg title, svg path) {
  display: none;
}

[aria-pressed="false"] :is(span:nth-of-type(1), title:nth-of-type(1), path:nth-of-type(1)),
[aria-pressed="true"] :is(span:nth-of-type(2), title:nth-of-type(2), path:nth-of-type(2)){
  display: block;
}

button svg {
  height: 75%;
  stroke: none;
}
!

JS 

              
                const NAV_CONTROL = document.querySelector('button')

const CONTROL_NAV = () => {
	NAV_CONTROL.setAttribute('aria-expanded', NAV_CONTROL.matches('[aria-expanded="false"]') ? true : false)
	NAV_CONTROL.setAttribute('aria-pressed', NAV_CONTROL.matches('[aria-expanded="false"]') ? true : false)
}

NAV_CONTROL.addEventListener('click', CONTROL_NAV)
!
999px

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