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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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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

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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If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

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Packages

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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 Skypack, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ES6 import usage.

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

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HTML 

              
                <div class="wrapper">
  <div class="heart-wrap">
    <svg class="heart" id="heart" viewBox="0 0 1920 3000" xmlns="http://www.w3.org/2000/svg">
      <path
        id="heart-path-3"
        transform="translate(974.58,767.88) rotate(-400) scale(0.001)"></path>
      <path
        id="heart-path-2"
        transform="translate(932.84,695.15) rotate(-400) scale(0.001)"></path>
      <path
        id="heart-path-1"
        transform="translate(888.72,629.18) rotate(-400) scale(0.001)"></path>
    </svg>
  </div>
</div>
!

CSS 

              
                * {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: #013f92;
}

svg {
  overflow: hidden;
}

.wrapper {
  position: relative;
  width: 100%;
  min-height: 100vh;
}

.heart-wrap {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.heart {
  z-index: 1;
  position: absolute;
  top: 0;
  left: 50%;
  width: 100%;
  height: 3000px;
  min-width: 1920px;
  pointer-events: none;
  transform: translate3d(-50%, 0, 0);
}
!

JS 

              
                let config = {
  // shape colors
  shapes: [
    {
      fill: '#f8566a',
      stroke: ''
    },
    {
      fill: 'transparent',
      stroke: '#f8566a'
    },
    {
      fill: 'transparent',
      stroke: '#f8566a'
    }
  ],

  // animation duration
  duration: 1200,

  // option allows you to rotate the second/end path in a way that the points
  // travel the least possible distance during morph, and as an effect the morph
  // animation feel more "natural".
  morph: 60,

  // get more easing functions
  // http://thednp.github.io/kute.js/easing.html
  easing: 'easingQuinticInOut'
}

let paths = [
  'M709.498 158c-171.062 0-336.86 170.013-414.112 244.508-81.05 78.16-220.906 117.187-220.906 306.215 0 237.322 163.682 598.787 348.781 514.902 126.72-57.429 183.931-99.993 253.844-275.484 54.084-135.757 210.296-193.167 210.296-420.15C887.4 290.672 946.747 158 709.498 158z',
  'M819.183 84C603.326 84 394.11 298.645 296.628 392.697 194.353 491.375 17.873 540.649 17.873 779.3c0 299.624 206.546 755.983 440.117 650.075 159.903-72.505 232.096-126.243 320.318-347.805 68.246-171.396 265.365-243.877 265.365-530.448C1043.673 251.499 1118.56 84 819.183 84z',
  'M929.557 11C666.76 11 412.049 272.269 293.37 386.75 168.855 506.864-46 566.84-46 857.333c0 364.706 251.46 920.194 535.82 791.281 194.676-88.254 282.567-153.665 389.972-423.354 83.087-208.625 323.07-296.851 323.07-645.67C1202.862 214.883 1294.034 11 929.557 11z'
];

let updatePaths = i => {
  document.querySelector(`#heart-path-${i + 1}`).setAttribute('d', paths[i]);
}

let transform = params => {
  for (let i = 0; i < 3; i++) {
    KUTE.to(`#heart-path-${i + 1}`,
      {
        path: paths[i],
        svgTransform: params
      }, {
        duration: config.duration,
        easing: config.easing,
        morphIndex: config.morph,
        complete() {
          if (i === 2) {
            params.callback();
            updatePaths(i);
          }
        }
      }
    ).start();
  }
}

for (let i = 0; i < 3; i++) {
  updatePaths(i);

  let selector = document.querySelector(`#heart-path-${i + 1}`);
  let fillColor = config.shapes[i].fill;
  let strokeColor = config.shapes[i].stroke;

  if (fillColor) {
    selector.setAttribute('fill', fillColor);
  }
  if (strokeColor) {
    selector.setAttribute('stroke', strokeColor);
  }
}

const transformParams = [
  {
    translate: [-370, -500],
    rotate: 0,
    scale: 1.001,
    callback() {
      transform(transformParams[1])
    }
  },
  {
    translate: [390, -180],
    rotate: 110,
    scale: 0.9,
    callback() {
      transform(transformParams[2])
    }
  },
  {
    translate: [350, -50],
    rotate: 45,
    scale: 1.3,
    callback() {
      transform(transformParams[0])
    }
  },
];

transform(transformParams[0])
!
999px

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