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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>

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CSS

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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.

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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 

              
                <link href="https://fonts.googleapis.com/css2?family=Graduate&display=swap" rel="stylesheet" />

<button id="button" class="glitch-button" aria-label="uplink">
  <svg xmlns="http://www.w3.org/2000/svg" width="900" height="240" viewBox="0 0 900 240" preserveAspecRatio="xmidYMid slice" xml:space="preserve">
    <defs>
      <filter id="dm-filter--hover" color-interpolation-filters="sRGB" preserveAspectRatio="none">
        <feFlood x="0" y="0" width="120%" height="100%" flood-color="rgb(128, 0, 128)" result="FEIMG-NO-TRANSFORM" />
        <feFlood x="0" y="0" width="120%" height="6px" flood-color="rgb(256, 0, 128)" result="FEIMG-XMAX">
          <animate attributeName="height" values="6px; 1px; 6px" dur="4s" repeatCount="indefinite" begin="0" />
          <animate attributeName="y" values="80px; 160px; 120px; 160px; 90px; 140px; 80px" dur="10s" repeatCount="indefinite" begin="0" />
        </feFlood>
        <feFlood x="0" y="0" width="120%" height="6px" flood-color="rgb(0, 0, 128)" result="FEIMG-XMIN">
          <animate attributeName="height" values="6px; 12px; 4px" dur="6s" repeatCount="indefinite" begin="0" />
          <animate attributeName="y" values="80px; 100px; 160px; 110px; 80px; 140px; 90px; 100px; 80px; 150px; 80px" dur="20s" repeatCount="indefinite" begin="0" />
        </feFlood>
        <feMerge result="MERGE">
          <feMergeNode in="FEIMG-NO-TRANSFORM" />
          <feMergeNode in="FEIMG-XMAX" />
          <feMergeNode in="FEIMG-XMIN" />
        </feMerge>
        <feDropShadow in="SourceGraphic" dx="0" dy="0" stdDeviation="00" flood-color="lime" result="SHADOW_LIME">
          <animate class="anim" calcMode="discrete" attributeName="dx" values="0; 0; 0; 0; 2; 0; 5; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; -3; 0; 0; -2; 0; 0; 0; 0; 0; 2; 0; 0; 4; 0; -3; 0; -4; 0; 0; 2; 0; 0; 5; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0" dur="7s" repeatCount="indefinite" begin="0" fill="freeze" />
          <animate class="anim" calcMode="discrete" attributeName="dy" values="0; 0; -1; 0; 0; 0; 0; 0; 3; 0; 0; 0; 0; 0; 5; 0; 0; 0; 0; 0; 2; 0; 0; -4; -3; 0; 0; 0; 2; -1; 3; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0" dur="7.5s" repeatCount="indefinite" begin="0" fill="freeze" />
        </feDropShadow>
        <feDropShadow in="SourceGraphic" dx="0" dy="0" stdDeviation="00" flood-color="red" result="SHADOW_FUCHSIA">
          <animate class="anim" calcMode="discrete" attributeName="dx" values="0; 0; 0; 0; 0; 0; .2; 0; 0; 0; -1; 0; 0; 0; 0; 0; 0; 4; 0; 0; 0; 0; 0; 0; 3; 0; 0; 0; 0; -3; 0; 0; 0; 2; 0; 1; 4; 0; 0; 0; 0; 0; 0; 5; 0; 0; -3; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0" dur="8s" repeatCount="indefinite" begin="0" fill="freeze" />
          <animate class="anim" calcMode="discrete" attributeName="dy" values="0; 0; 2; 0; 0; 0; 0; 0; 0; 0; -2; 0; 0; 0; -4; 0; 0; 0; 0; -3; 0; 0; 0; 5; 3; 0; 0; 0; 0; 0; 0; 0; -2; 0; 0; 0; 4; 0; 0; 0; 0; 0; 0; 0; 0; 0; -1; 0; 0; 0; 0; 0; 0; 0; 0; 0" dur="7.7s" repeatCount="indefinite" begin="0" fill="freeze" />
        </feDropShadow>
        <feBlend in="SHADOW_LIME" in2="SHADOW_FUCHSIA" result="BLEND_SHADOW" mode="screen" />

        <feDisplacementMap in="BLEND_SHADOW" in2="MERGE" scale="10" xChannelSelector="R" yChannelSelector="B">
          <animate attributeName="scale" values="-10; 5; 0; 10; 3; 8; -2; -8; 4; -5; 10; 6" dur="10s" repeatCount="indefinite" begin="0" />
        </feDisplacementMap>
      </filter>
    </defs>
    <svg class="filter" xmlns="http://www.w3.org/2000/svg" width="600" height="400" viewBox="0 0 600 400" preserveAspecRatio="none">
      <defs>
        <filter id="dm-filter--active" color-interpolation-filters="sRGB" preserveAspectRatio="none">
          <feImage id="feimage-glitchmask-r" preserveAspectRatio="none" result="FEIMG-GLITCH-R" width="150%" height="100%" x="0" y="0">
            <animate class="glitch-anim" id="an" attributeName="width" values="100%; 200%; 100%" dur="0.3s" repeatCount="1" begin="click" />
            <animate class="glitch-anim" attributeName="height" values="100%; 200%; 100%" dur="0.2s" repeatCount="1" begin="click" fill="freeze" />
            <animate class="glitch-anim" attributeName="y" values="0; 50; 0" dur="0.25s" repeatCount="1" begin="click" />
          </feImage>

          <feImage id="feimage-glitchmask-b" preserveAspectRatio="none" result="FEIMG-GLITCH-B" width="150%" height="100%" x="0" y="0">
            <animate class="glitch-anim" attributeName="width" values="300%; 100%; 300%" dur="0.25s" repeatCount="1" begin="click" fill="freeze" />
            <animate class="glitch-anim" attributeName="height" values="80%; 100%; 80%" dur="0.3s" repeatCount="1" begin="click" fill="freeze" />
            <animate class="glitch-anim" attributeName="y" values="0; 10; 0" dur="0.2s" repeatCount="1" begin="click" />
          </feImage>

          <feBlend in="FEIMG-GLITCH-R" in2="FEIMG-GLITCH-B" result="BLEND_DMMAP" mode="screen" />

          <feDropShadow in="SourceGraphic" dx="0" dy="0" stdDeviation="00" flood-color="lime" result="SHADOW_LIME">
            <animate class="glitch-anim" calcMode="discrete" attributeName="dx" values="6; 11; 5; 0; 4; 0; -3; -7; 12; -2; -8; 0; 0; 17; 0; 6; 14; 6; -13; 0; -7; 0; 0; 8; 11; 4; 15; -7" dur="0.3s" repeatCount="1" begin="click" />
            <animate class="glitch-anim" calcMode="discrete" attributeName="dy" values="5; 0; -4; -9; 0; 11; 8; 0; 10; -8; 15; -12; 12; -6; 0; -8; -4; 6; 9; 16; 0; 4; -4; 5; 0; -10; 0" dur="0.4s" repeatCount="1" begin="click" />
          </feDropShadow>

          <feDropShadow in="SourceGraphic" dx="0" dy="0" stdDeviation="00" flood-color="red" result="SHADOW_RED">
            <animate class="glitch-anim" calcMode="discrete" attributeName="dx" values="0; 10; 14; -13; 0; -9; -13; 0; 16; 12; 10; -10; 8;  5; -6; 13; 0; 9; 11; 0; 14; 0; 0; -8; 3" dur="0.3s" repeatCount="1" begin="click" />
            <animate class="glitch-anim" calcMode="discrete" attributeName="dy" values="0; 7; 10; 3; -13; -8; -6; -8; 0; -12; 0; 0; 0; 14; 9; 0; 15; 17; 0; -6; 0; -9; 8; 14; -6; 0" dur="0.3s" repeatCount="1" begin="click" />
          </feDropShadow>

          <feBlend in="SHADOW_LIME" in2="SHADOW_RED" result="BLEND_SHADOW" mode="screen" />

          <feDisplacementMap in="BLEND_SHADOW" in2="BLEND_DMMAP" scale="0" xChannelSelector="R" yChannelSelector="B">
            <animate class="glitch-anim" attributeName="scale" values="0; 300; 0" dur="0.3s" repeatCount="1" begin="click" />
          </feDisplacementMap>
        </filter>
      </defs>
    </svg>
    <g id="filtered">
      <rect width="100%" height="100%" fill="transparent" />
      <text class="glitch-button__text" y="50%" x="50%" text-anchor="middle">
        <tspan dx="1" dy="31">[ T&#x200A;ickl&#160;&#160;&#160;&#160;&#160;&#160;&#160;Beam ]</tspan>
      </text>
      <text class="glitch-button__text" y="50%" x="50%" text-anchor="middle">
        <tspan dx="33" dy="31">[ By&#x200A;te&#160;&#160;&#160;&#160;&#160;&#160;&#160;Cranc ]</tspan>
      </text>
      <circle cx="50%" cy="50%" r="50px" fill="white" style="display: none;" />
      <image class="glitch-button__img" href="https://assets.codepen.io/100347/fedm_bot-1.svg" x="50%" y="50%" height="140" width="140" transform="translate(-70, -70)" />
      <image class="glitch-button__img" href="https://assets.codepen.io/100347/fedm_bot-2.svg" x="50%" y="50%" height="140" width="140" transform="translate(-70, -70)" />
      <g transform="translate(-90, -90)">
        <svg x="50%" y="50%" width="180" height="180" viewBox="-90 -90 180 180" style="overflow: visible;">
          <path class="spin1" id="arc1" d="" />
          <path class="spin2" id="arc2" d="" /> <!-- -->
          <path class="spin3" id="arc3" d="" />
        </svg>
      </g>
    </g>
  </svg>
</button>
!

CSS 

              
                @use postcss-preset-env;

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    height: 100%;
}

p {
    margin-bottom: 1em;
}

.filter {
    position: absolute;
    top: 0;
    left: -1;
    width: 1px;
    height: 1px;
    visibility: hidden;
}

body {
    margin: 0;
    padding: 1.25em;
    height: 100%;
    color: white;
    font: 0.85em -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    min-width: 320px;
    display: flex;
    align-items: center;
    text-align: center;
    background-color: #2e2d42;
    background-size: auto, contain, 100% 100%;

    @nest .jpg & {
        background-image: radial-gradient(circle, rgba(0, 0, 0, 0.5) 0%, rgba(0, 0, 0, 0.9) 80%),
        repeating-radial-gradient(circle, transparent, transparent 2px, #2a3d37 2px, #2a3d37 4px),
        url('https://assets.codepen.io/100347/fedm_metal.jpg');
    }

    @nest .webp & {
        background-image: radial-gradient(circle, rgba(0, 0, 0, 0.5) 0%, rgba(0, 0, 0, 0.9) 80%),
        repeating-radial-gradient(circle, transparent, transparent 2px, #2a3d37 2px, #2a3d37 4px),
        url('https://assets.codepen.io/100347/fedm_metal.webp');
    }
}

.glitch-button {
    display: block;
    border: none;
    background: transparent;
    position: relative;
    margin: 0 auto;
    flex: 0 0 auto;
    cursor: crosshair;

    &:hover {
        outline: none;
    }
}

@media screen and (prefers-reduced-motion: no-preference) {
    .glitch-button__filtered {
        &:active,
        &:hover,
        &:focus {
            filter: url('#dm-filter--hover');
        }

        @nest .glitch-button--morphing & {
            filter: url('#dm-filter--active');
        }
    }
}

.glitch-button__text {
    fill: white;
    font: 80px/0.75 'Graduate', sans-serif;
    text-transform: uppercase;
}

.glitch-button__text,
.glitch-button__img {
    @nest .glitch-button--inactive &:nth-of-type(1) {
        pointer-events: auto;
        animation: swapTextIn 0.15s 1 forwards;
    }

    @nest .glitch-button--active &:nth-of-type(1) {
        pointer-events: none;
        animation: swapTextOut 0.15s 1 forwards;
    }

    &:nth-of-type(2) {
        visibility: hidden;
        pointer-events: none;
    }

    @nest .glitch-button--inactive &:nth-of-type(2) {
        pointer-events: none;
        animation: swapTextOut 0.15s 1 forwards;
    }

    @nest .glitch-button--active &:nth-of-type(2) {
        pointer-events: auto;
        animation: swapTextIn 0.15s 1 forwards;
    }
}

.spin1,
.spin2,
.spin3 {
    fill: none;
    stroke-width: 6px;
    stroke: white;
    opacity: 1;
}

.spin2 {
    stroke-width: 3px;
}

.spin3 {
    stroke-width: 3px;
}

@keyframes swapTextOut {
    0% {
        visibility: visible;
    }

    100%,
    50% {
        visibility: hidden;
    }
}

@keyframes swapTextIn {
    0%,
    50% {
        visibility: hidden;
    }

    100% {
        visibility: visible;
    }
}
!

JS 

              
                webpSupported();

new Spinner("#arc1", 88, 10, 50, 4000, -5000);
new Spinner("#arc2", 83.5, 90, 170, -6000, 10000);
new Spinner("#arc3", 92.5, 70, 260, 4500, 9000);

const button = document.getElementById("button");

async function fetchImage(imgURL, feImgID) {
  const imageFetched = new Promise((resolve) => {
    fetch(imgURL, {
      method: "GET",
      headers: new Headers(),
      mode: "cors",
      cache: "default"
    })
      .then((response) => {
        return response.text();
      })
      .then((svgText) => {
        const feImg = document.getElementById(feImgID);
        const uri = encodeURIComponent(svgText);

        if (feImg) {
          feImg.setAttribute("href", `data:image/svg+xml;charset=utf-8,${uri}`);

          resolve();
        }

        resolve(false);
      });
  });

  return await imageFetched;
}

Promise.all([
  fetchImage(
    "https://assets.codepen.io/100347/fedm_glitch-blue.svg",
    "feimage-glitchmask-b"
  ),
  fetchImage(
    "https://assets.codepen.io/100347/fedm_glitch-red.svg",
    "feimage-glitchmask-r"
  )
]).then(() => {
  requestAnimationFrame(() => {
    document
      .getElementById("filtered")
      .classList.add("glitch-button__filtered");
  });
});

const animations = document.querySelectorAll(".glitch-anim");
let timeout;
const animate = (option) => {
  for (let animation of animations) {
    animation[`${option}Element`]();
  }
};

const startAnim = () => {
  button.removeEventListener("click", startAnim);
  button.addEventListener("click", revertAnim);
  button.classList.remove("glitch-button--inactive");
  button.classList.add("glitch-button--active", "glitch-button--morphing");

  setTimeout(() => {
    button.classList.remove("glitch-button--morphing");
  }, 300);

  animate("begin");
  timeout = setTimeout(revertAnim, 8000);
};

const revertAnim = () => {
  clearTimeout(timeout);
  button.removeEventListener("click", revertAnim);
  button.addEventListener("click", startAnim);
  button.classList.remove("glitch-button--active");
  button.classList.add("glitch-button--inactive", "glitch-button--morphing");

  setTimeout(() => {
    button.classList.remove("glitch-button--morphing");
  }, 300);

  animate("begin");
};

button.addEventListener("click", startAnim);
!
999px

Console