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HTML

About HTML Preprocessors

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.

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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 

              
                <h1>Silky smooth checkbox toggles</h1>

<div class="wrapper">
  <div class="input-container">
    <input id="slide-toggle-control" type="checkbox" value="1" />
    <label id="slide-toggle-label" for="slide-toggle-control" class="control-label">
      <svg height="36" width="100" xmlns="http://www.w3.org/2000/svg">
        <g class="switch">
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        </g>
      </svg>
    </label>
    <label for="slide-toggle-control">Offset</label>
  </div>

  <div class="input-container">
    <input id="random-slide-toggle-control" type="checkbox" value="1" />
    <label id="random-slide-toggle-label" for="random-slide-toggle-control" class="control-label">
      <svg height="36" width="100" xmlns="http://www.w3.org/2000/svg">
        <g class="switch">
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      </svg>
    </label>
    <label for="random-slide-toggle-control">Random</label>
  </div>
  
  <div class="input-container">
    <input id="delayed-offset-slide-toggle-control" type="checkbox" value="1" />
    <label id="delayed-offset-slide-toggle-label" for="delayed-offset-slide-toggle-control" class="control-label">
      <svg height="36" width="100" xmlns="http://www.w3.org/2000/svg">
        <g class="switch">
          <g class="row">
            <rect x="6" y="6" width="2" height="2" />
            <rect x="8" y="6" width="2" height="2" />
            <rect x="10" y="6" width="2" height="2" />
            <rect x="12" y="6" width="2" height="2" />
            <rect x="14" y="6" width="2" height="2" />
            <rect x="16" y="6" width="2" height="2" />
            <rect x="18" y="6" width="2" height="2" />
            <rect x="20" y="6" width="2" height="2" />
            <rect x="22" y="6" width="2" height="2" />
            <rect x="24" y="6" width="2" height="2" />
            <rect x="26" y="6" width="2" height="2" />
            <rect x="28" y="6" width="2" height="2" />
          </g>

          <g class="row">
            <rect x="6" y="8" width="2" height="2" />
            <rect x="8" y="8" width="2" height="2" />
            <rect x="10" y="8" width="2" height="2" />
            <rect x="12" y="8" width="2" height="2" />
            <rect x="14" y="8" width="2" height="2" />
            <rect x="16" y="8" width="2" height="2" />
            <rect x="18" y="8" width="2" height="2" />
            <rect x="20" y="8" width="2" height="2" />
            <rect x="22" y="8" width="2" height="2" />
            <rect x="24" y="8" width="2" height="2" />
            <rect x="26" y="8" width="2" height="2" />
            <rect x="28" y="8" width="2" height="2" />
          </g>

          <g class="row">
            <rect x="6" y="10" width="2" height="2" />
            <rect x="8" y="10" width="2" height="2" />
            <rect x="10" y="10" width="2" height="2" />
            <rect x="12" y="10" width="2" height="2" />
            <rect x="14" y="10" width="2" height="2" />
            <rect x="16" y="10" width="2" height="2" />
            <rect x="18" y="10" width="2" height="2" />
            <rect x="20" y="10" width="2" height="2" />
            <rect x="22" y="10" width="2" height="2" />
            <rect x="24" y="10" width="2" height="2" />
            <rect x="26" y="10" width="2" height="2" />
            <rect x="28" y="10" width="2" height="2" />
          </g>

          <g class="row">
            <rect x="6" y="12" width="2" height="2" />
            <rect x="8" y="12" width="2" height="2" />
            <rect x="10" y="12" width="2" height="2" />
            <rect x="12" y="12" width="2" height="2" />
            <rect x="14" y="12" width="2" height="2" />
            <rect x="16" y="12" width="2" height="2" />
            <rect x="18" y="12" width="2" height="2" />
            <rect x="20" y="12" width="2" height="2" />
            <rect x="22" y="12" width="2" height="2" />
            <rect x="24" y="12" width="2" height="2" />
            <rect x="26" y="12" width="2" height="2" />
            <rect x="28" y="12" width="2" height="2" />
          </g>

          <g class="row">
            <rect x="6" y="14" width="2" height="2" />
            <rect x="8" y="14" width="2" height="2" />
            <rect x="10" y="14" width="2" height="2" />
            <rect x="12" y="14" width="2" height="2" />
            <rect x="14" y="14" width="2" height="2" />
            <rect x="16" y="14" width="2" height="2" />
            <rect x="18" y="14" width="2" height="2" />
            <rect x="20" y="14" width="2" height="2" />
            <rect x="22" y="14" width="2" height="2" />
            <rect x="24" y="14" width="2" height="2" />
            <rect x="26" y="14" width="2" height="2" />
            <rect x="28" y="14" width="2" height="2" />
          </g>

          <g class="row">
            <rect x="6" y="16" width="2" height="2" />
            <rect x="8" y="16" width="2" height="2" />
            <rect x="10" y="16" width="2" height="2" />
            <rect x="12" y="16" width="2" height="2" />
            <rect x="14" y="16" width="2" height="2" />
            <rect x="16" y="16" width="2" height="2" />
            <rect x="18" y="16" width="2" height="2" />
            <rect x="20" y="16" width="2" height="2" />
            <rect x="22" y="16" width="2" height="2" />
            <rect x="24" y="16" width="2" height="2" />
            <rect x="26" y="16" width="2" height="2" />
            <rect x="28" y="16" width="2" height="2" />
          </g>

          <g class="row">
            <rect x="6" y="18" width="2" height="2" />
            <rect x="8" y="18" width="2" height="2" />
            <rect x="10" y="18" width="2" height="2" />
            <rect x="12" y="18" width="2" height="2" />
            <rect x="14" y="18" width="2" height="2" />
            <rect x="16" y="18" width="2" height="2" />
            <rect x="18" y="18" width="2" height="2" />
            <rect x="20" y="18" width="2" height="2" />
            <rect x="22" y="18" width="2" height="2" />
            <rect x="24" y="18" width="2" height="2" />
            <rect x="26" y="18" width="2" height="2" />
            <rect x="28" y="18" width="2" height="2" />
          </g>

          <g class="row">
            <rect x="6" y="20" width="2" height="2" />
            <rect x="8" y="20" width="2" height="2" />
            <rect x="10" y="20" width="2" height="2" />
            <rect x="12" y="20" width="2" height="2" />
            <rect x="14" y="20" width="2" height="2" />
            <rect x="16" y="20" width="2" height="2" />
            <rect x="18" y="20" width="2" height="2" />
            <rect x="20" y="20" width="2" height="2" />
            <rect x="22" y="20" width="2" height="2" />
            <rect x="24" y="20" width="2" height="2" />
            <rect x="26" y="20" width="2" height="2" />
            <rect x="28" y="20" width="2" height="2" />
          </g>

          <g class="row">
            <rect x="6" y="22" width="2" height="2" />
            <rect x="8" y="22" width="2" height="2" />
            <rect x="10" y="22" width="2" height="2" />
            <rect x="12" y="22" width="2" height="2" />
            <rect x="14" y="22" width="2" height="2" />
            <rect x="16" y="22" width="2" height="2" />
            <rect x="18" y="22" width="2" height="2" />
            <rect x="20" y="22" width="2" height="2" />
            <rect x="22" y="22" width="2" height="2" />
            <rect x="24" y="22" width="2" height="2" />
            <rect x="26" y="22" width="2" height="2" />
            <rect x="28" y="22" width="2" height="2" />
          </g>

          <g class="row">
            <rect x="6" y="24" width="2" height="2" />
            <rect x="8" y="24" width="2" height="2" />
            <rect x="10" y="24" width="2" height="2" />
            <rect x="12" y="24" width="2" height="2" />
            <rect x="14" y="24" width="2" height="2" />
            <rect x="16" y="24" width="2" height="2" />
            <rect x="18" y="24" width="2" height="2" />
            <rect x="20" y="24" width="2" height="2" />
            <rect x="22" y="24" width="2" height="2" />
            <rect x="24" y="24" width="2" height="2" />
            <rect x="26" y="24" width="2" height="2" />
            <rect x="28" y="24" width="2" height="2" />
          </g>

          <g class="row">
            <rect x="6" y="26" width="2" height="2" />
            <rect x="8" y="26" width="2" height="2" />
            <rect x="10" y="26" width="2" height="2" />
            <rect x="12" y="26" width="2" height="2" />
            <rect x="14" y="26" width="2" height="2" />
            <rect x="16" y="26" width="2" height="2" />
            <rect x="18" y="26" width="2" height="2" />
            <rect x="20" y="26" width="2" height="2" />
            <rect x="22" y="26" width="2" height="2" />
            <rect x="24" y="26" width="2" height="2" />
            <rect x="26" y="26" width="2" height="2" />
            <rect x="28" y="26" width="2" height="2" />
          </g>

          <g class="row">
            <rect x="6" y="28" width="2" height="2" />
            <rect x="8" y="28" width="2" height="2" />
            <rect x="10" y="28" width="2" height="2" />
            <rect x="12" y="28" width="2" height="2" />
            <rect x="14" y="28" width="2" height="2" />
            <rect x="16" y="28" width="2" height="2" />
            <rect x="18" y="28" width="2" height="2" />
            <rect x="20" y="28" width="2" height="2" />
            <rect x="22" y="28" width="2" height="2" />
            <rect x="24" y="28" width="2" height="2" />
            <rect x="26" y="28" width="2" height="2" />
            <rect x="28" y="28" width="2" height="2" />
          </g>
        </g>
      </svg>
    </label>
    <label for="delayed-offset-slide-toggle-control">Delayed offset</label>
  </div>
</div>
!

CSS 

              
                @import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@300&display=swap");
@import url('https://fonts.googleapis.com/css2?family=Lexend+Deca:wght@300&display=swap');

html,
body {
  height: 100%;
}

body {
  background-color: #3d3e4a;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #a3a7ad;
  font-family: "IBM Plex Mono", monospace;
  font-weight: 300;
  font-style: normal;
  font-size: 12px;
  flex-direction: column;
}

h1 {
  background-color: rgba(0, 0, 0, 0.5);
  color: #76b3fa;
  font-size: 20px;
  font-family: "Lexend Deca", sans-serif;
  font-weight: 300;
  margin-bottom: 30px;
  padding: 20px 0;
  text-align: center;
  width: 100%;
}

.wrapper {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  margin: 10px;
}

.input-container {
  border-radius: 8px;
  display: flex;
  align-items: center;
  flex-direction: column;
  margin: 10px 20px;
  position: relative;
}

.control-label {
  background-color: #24252c;
  background-image: repeating-linear-gradient(
    0deg,
    #181a29,
    #181a29 2px,
    #202436 2px,
    #202436 4px
  );
  border: 2px solid #575969;
  border-radius: 4px;
  display: block;
  width: 84px;
  height: 36px;
  position: relative;
  transition: border-color 300ms ease-in-out, box-shadow 300ms ease-in-out;
  margin-bottom: 15px;
}

input[type="checkbox"] {
  opacity: 0;
  position: absolute;
}

input[type="checkbox"]:checked + label {
  border-color: #76b3fa;
  box-shadow: 0 0 20px 0 #0763f7, inset 0px 0px 12px 0px #0763f7;

  svg {
    rect {
      fill: #76b3fa;
    }
  }
}

input[type="checkbox"]:focus + label {
  border-color: #76b3fa;
}

svg {
  rect {
    fill: #484a57;
    transition: fill 300ms ease-in-out;
  }

  .reference rect {
    opacity: 0;
  }
}
!

JS 

              
                SVG.on(document, "DOMContentLoaded", () => {
  const slideToggle = document.getElementById("slide-toggle-control");
  const randomSlideToggle = document.getElementById("random-slide-toggle-control");
  const delayedSlideToggle = document.getElementById("delayed-offset-slide-toggle-control");

  const slide = {
    element: slideToggle,
    handler: svgSlideEffect,
    offset: 10,
    duration: 200,
    random: false,
  };

  const randomSlide = {
    element: randomSlideToggle,
    handler: svgSlideEffect,
    offset: 8,
    duration: 150,
    random: true,
  };
  
  const delayedOffsetSlide = {
    element: delayedSlideToggle,
    handler: svgSlideEffect,
    offset: 50,
    duration: 50,
    random: false,
  };

  new SvgToggleEffect(slide);
  new SvgToggleEffect(randomSlide);
  new SvgToggleEffect(delayedOffsetSlide);
});

class SvgToggleEffect {
  constructor(effect) {
    this.nodes = [
      ...effect.element.nextElementSibling.querySelectorAll(".row")
    ];

    this.nodes.forEach((node, index) => {
      this.nodes[index] = SVG(node);
    });

    if (effect.random) {
      this.randomizeArray(this.nodes);
    }

    effect.element.addEventListener("change", () => {
      if (effect.element.checked) {
        effect.handler(this.nodes, false, effect.duration, effect.offset);
      } else {
        effect.handler(this.nodes, true, effect.duration, effect.offset);
      }
    });
  }

  randomizeArray(array) {
    for (let i = array.length - 1; i > 0; i--) {
      const j = Math.floor(Math.random() * (i + 1));
      [array[i], array[j]] = [array[j], array[i]];
    }
  }
}

const svgSlideEffect = (nodes = [], reverse = false, duration = 100, offset = 10) => {
  nodes.forEach((node, index) => {
    setTimeout(() => {
      if (reverse) {
        node.animate({ duration: duration }).transform({ translate: 0 });
      } else {
        node.animate({ duration: duration }).transform({ translate: 48 });
      }
    }, index * offset);
  });
};
!
999px

Console