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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-.

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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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HTML 

              
                <link href="https://fonts.googleapis.com/css2?family=Corben:wght@700&display=swap" rel="stylesheet" />

<svg class="container" xmlns="http://www.w3.org/2000/svg" width="100%" height="100%" viewBox="0 0 800 400">
  <defs>
    <svg id="mask-text" xmlns="http://www.w3.org/2000/svg" width="100" height="100">
      <linearGradient id="gradient" x1="0" x2="0" y1="0" y2="1" color-interpolation="sRGB" gradientUnits="objectBoundingBox">
        <stop offset="0" stop-color="#000000" />
        <stop offset=".86" stop-color="#000000" />
        <stop offset="1" stop-color="#000000" stop-opacity="0" />
      </linearGradient>
      <rect width="100%" height="100%" fill="url(#gradient)" />
    </svg>
    <svg id="mask-blur" xmlns="http://www.w3.org/2000/svg" width="100" height="100">
      <linearGradient id="gradient" x1="0" x2="0" y1="0" y2="1" color-interpolation="sRGB" gradientUnits="objectBoundingBox">
        <stop offset="0" stop-color="#000000" stop-opacity="0" />
        <stop offset=".2" stop-color="#000000" />
        <stop offset=".55" stop-color="#000000" />
        <stop offset="1" stop-color="#000000" stop-opacity="0" />
      </linearGradient>
      <rect width="100%" height="100%" fill="url(#gradient)" />
    </svg>
    <svg id="mask-displace" xmlns="http://www.w3.org/2000/svg" width="100" height="100">
      <linearGradient id="gradient" x1="0" x2="0" y1="0" y2="1" color-interpolation="sRGB" gradientUnits="objectBoundingBox">
        <stop offset="0" stop-color="rgb(127,0,127)" />
        <stop offset="1" stop-color="rgb(127,0,127)" stop-opacity="0" />
      </linearGradient>
      <rect width="100%" height="100%" fill="url(#gradient)" />
    </svg>
    <filter id="dm-filter" x="0" y="0" width="100%" height="100%" color-interpolation-filters="sRGB" preserveAspectRatio="none">
      <!-- Creating three color versions of the input text: -->
      <feFlood flood-color="#FF50F6" flood-opacity="0.8" result="PINK" />
      <feFlood flood-color="#43FFFF" flood-opacity="0.8" result="CYAN" />
      <feFlood flood-color="#9C00FF" flood-opacity="0.8" result="VIOLET" />
      <feComposite operator="in" in="PINK" in2="SourceAlpha" result="PINK_TEXT" />
      <feComposite operator="in" in="CYAN" in2="SourceAlpha" result="CYAN_TEXT" />
      <feComposite operator="in" in="VIOLET" in2="SourceAlpha" result="VIOLET_TEXT" />

      <!-- Offsetting every instance of couloured text: -->
      <feOffset in="PINK_TEXT" dx="-15" dy="5" result="PINK_TEXT_OFF" />
      <feOffset in="CYAN_TEXT" dx="0" dy="7" result="CYAN_TEXT_OFF" />
      <feOffset in="VIOLET_TEXT" dx="15" dy="3" result="VIOLET_TEXT_OFF" />

      <!-- Blending the first two colors: -->
      <feBlend in="PINK_TEXT_OFF" in2="CYAN_TEXT_OFF" result="BLEND_PC" mode="screen" />

      <!-- Blending the third color: -->
      <feBlend in="BLEND_PC" in2="VIOLET_TEXT_OFF" result="BLEND_ALL" mode="normal" />

      <!-- Merging the original filter input (the text) and the 3 color versions -->
      <feMerge result="MERGE_ALL">
        <feMergeNode in="BLEND_ALL" />
        <feMergeNode in="SourceGraphic" />
      </feMerge>

      <!-- A bitmap that will be the displacment map. Href value will be set by javascript, bcs. CORS and this way we can decide wether to feed a WebP image to newer browsers. -->
      <feImage id="feimage-map" href="" data-map="https://assets.codepen.io/100347/fedm_vertical-map" width="100%" height="1936" x="0" y="-1536" result="MAP" preserveAspectRatio="none">
        <animate attributeName="y" values="-1536;0;" dur="10s" repeatCount="1000" />
      </feImage>

      <!-- A linear gradient. We will use it as a mask to fade out the text at the bottom -->
      <feImage href='#mask-text' x="0" y="0" width="100%" height="51%" result="MASK_TEXT" preserveAspectRatio="none" />

      <!-- One more linear gradient. This one will be used to fade out the "drip" at the top. This way we achieve a smotth transition from the text to the blurry dripping part.  -->
      <feImage href='#mask-blur' x="0" y="35%" width="100%" height="60%" result="MASK_BLUR" preserveAspectRatio="none" />

      <!-- And one last SVG image containing a linear gradient from rgba(128, 0, 128, 1) to rgba(128, 0, 128, 0). We will merge this with the animated displacement image, so that the displacement effect will increase gradually form zero at the top to its full extend at the end of the gradient. -->
      <feImage href='#mask-displace' x="0" y="40%" width="100%" height="20%" result="MASK_DISPLACE" preserveAspectRatio="none" />

      <!-- Merging the animated image and the gradient.  -->
      <feMerge result="MERGE_MASK">
        <feMergeNode in="MAP" />
        <feMergeNode in="MASK_DISPLACE" />
      </feMerge>

      <!-- Using the output of the merge to create a displacement map filter primitive: -->
      <feDisplacementMap in="MERGE_ALL" in2="MERGE_MASK" result="DISPLACE_MERGE" scale="-300" xChannelSelector="R" yChannelSelector="B" />
      <feGaussianBlur in="DISPLACE_MERGE" stdDeviation="6" result="BLUR_DISPLACE" />

      <feComposite in2="MASK_BLUR" in="BLUR_DISPLACE" operator="in" result="COMP_DISPLACE" />
      <feComposite in2="MASK_TEXT" in="SourceGraphic" operator="in" result="COMP_SOURCE" />

      <feMerge result="MERGE">
        <feMergeNode in="COMP_DISPLACE" />
        <feMergeNode in="COMP_SOURCE" />
      </feMerge>
    </filter>
  </defs>
  <g class="displacement">
    <svg width="100%" height="100%" viewBox="0 0 800 400">
      <rect width="100%" height="100%" fill="transparent" />
      <text class="corben" y="50%" x="50%" text-anchor="middle" letter-spacing="-.09em">
        Jelly Drip
      </text>
    </svg>
  </g>
</svg>
!

CSS 

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

html {
    height: 100%;
}

body {
    margin: 0;
    padding: 1.25em;
    height: 100%;
    color: white;
    font: 0.85em -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    min-width: 320px;
}

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


body {
    position: relative;
    overflow: hidden;
    text-align: center;
    background: linear-gradient(
            0deg,
            rgba(19, 0, 34, 0.3),
            rgba(19, 0, 34, 0.9) 35%,
            rgba(19, 0, 34, 1) 50%,
            rgba(19, 0, 34, 0.9) 65%,
            rgba(19, 0, 34, 0.3)
        ),
        url(https://assets.codepen.io/100347/fedm_bgpattern-warped.svg) center no-repeat, rgb(19, 0, 34);
    background-size: 100%;
    display: flex;
}

.container {
    position: relative;
    width: 800px;
    height: 400px;
    margin: auto;
}

.displacement {
    filter: url('#dm-filter');
}

.corben {
    display: block;
    position: relative;
    margin: 0 auto;
    padding: 0.5em;
    top: 50%;
    fill: white;
    font: 120px/0.75 'Corben', sans-serif;
}

.infotext {
    font: 0.8em/0.75 'Bungee', sans-serif;
}
!

JS 

              
                const feImages = document.querySelectorAll('feImage');

webpSupported().then((supported) => {
    const suffix = supported ? 'webp' : 'jpg';

    for (let feImg of feImages) {
        const href = feImg.getAttribute('href');

        if (/^#/g.test(href)) {
            const fragment = document.querySelector(href);
            const fragmentString = encodeURIComponent(fragment.outerHTML);

            feImg.setAttribute('href', `data:image/svg+xml;charset=utf-8,${fragmentString}`)
        } else if (feImg.getAttribute('data-map')) {
            const map = feImg.getAttribute('data-map');

            fetch(`${map}.${suffix}`, {
                method: 'GET',
                headers: new Headers(),
                mode: 'cors',
                cache: 'default',
            })
                .then((response) => {
                    return response.blob();
                })
                .then((blob) => {
                    return URL.createObjectURL(blob);
                })
                .then((url) => {
                    feImg.setAttribute('href', url);
                });
        }
    }
});
!
999px

Console