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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.

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-.

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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 

              
                <svg class="hide" id="main">
  <symbol id="planet-1" viewBox="-3 -3 180 103"><g>    
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    </g></symbol>
  
<symbol id="planet-2" viewBox="0 0 180 115">
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    <circle class="drawPath"  cx="62.5" cy="55.2" r="4" fill="none" stroke="#000" stroke-miterlimit="10" stroke-width="2"/>
    <line class="drawPath"  x1="57.8" y1="10.7" x2="57.8" y2="10.7" fill="none" stroke="#000" stroke-miterlimit="10" stroke-width="1.71"/>
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    <line class="drawPath"  x1="59" y1="10.1" x2="83.3" y2="19.2" fill="none" stroke="#000" stroke-linecap="round" stroke-miterlimit="10" stroke-width="2"/>
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    <line class="drawPath"  x1="124.7" y1="51.6" x2="137.2" y2="56.4" fill="none" stroke="#000" stroke-linecap="round" stroke-miterlimit="10" stroke-width="2"/>
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  </g>
</symbol>
  
<symbol id="moon-crescent" viewBox="0 -5 95 110">
  <g>    
    <path class="drawPath" d="M91.1,80.3a0.8,0.8,0,0,1,.7,1.3A50.5,50.5,0,1,1,39.9,2.1,50.9,50.9,0,0,1,46.6,1a0.6,0.6,0,0,1,.5.9c-12.4,14.3-16.4,34-9,51C47,73.4,67.8,81.4,91.1,80.3Z" fill="none" stroke="#000" stroke-miterlimit="10" stroke-width="2"/>
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    <path class="drawPath" d="M63.2,19.2l-0.7-2H62.4l-2-.7a0.1,0.1,0,0,1,0-.2l2-.7,0.2-.2,0.7-2h0.2l0.7,2,0.2,0.2,2,0.7a0.1,0.1,0,0,1,0,.2l-2,.7H64.1l-0.7,2H63.2Z" fill="none" stroke="#000" stroke-miterlimit="10" stroke-width="2"/></g></symbol> 
  
<symbol id="moon-full" viewBox="0 0 103 105">
  <g>    
  <circle class="drawPath" class="drawPath" cx="51" cy="51" r="50" fill="none"  stroke-miterlimit="10" stroke-width="2"/>
    <circle class="drawPath" cx="22.5" cy="43.5" r="6.4" fill="none" stroke="#000" stroke-miterlimit="10" stroke-width="2"/>
    <circle class="drawPath" cx="78.3" cy="42.4" r="12.1" fill="none" stroke="#000" stroke-miterlimit="10" stroke-width="2"/>
    <circle class="drawPath" cx="53.2" cy="74.3" r="7.3" fill="none" stroke="#000" stroke-miterlimit="10" stroke-width="2"/>
  </g>
  </symbol>
  
<symbol id="constellation" viewBox="0 -1 130 104"><g> 
      <polyline class="drawPath" points="5.3 11.8 46.5 4.3 46.5 28.4 20.9 35.3 5.3 11.8" fill="none" stroke="#000" stroke-miterlimit="10" stroke-width="2"/>
      <polyline class="drawPath" points="125.8 97.3 106.1 65.7 81.2 41.6 46.4 28.4" fill="none" stroke="#000000" stroke-miterlimit="10" stroke-width="2"/>
      <polygon class="drawPath" fill="#ffffff" points="124.9 93.3 127.1 90.9 126.9 94.1 130.2 93.9 127.7 96.1 130.2 98.3 126.9 98.1 127.1 101.4 124.9 99 122.7 101.4 122.8 98.1 119.6 98.3 122 96.1 119.6 93.9 122.8 94.1 122.7 90.9 124.9 93.3"/>
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</g></symbol>
  
<symbol id="comet" viewBox="0 -4 106 108">
  <g>
    <path class="drawPath" d="M1,41.3L52.6,92.9a25.2,25.2,0,0,0,10.6,6.3,27,27,0,0,0,26.7-7c10.5-10.5,10.8-27.2.7-37.3S39.4,5,39.4,5" fill="none" stroke="#ffffff" stroke-linecap="round" stroke-width="2"/>
    <path class="drawPath" d="M84.2,58.8c7.8,6.6,8.5,18.7,1.5,27a19.8,19.8,0,0,1-19,6.8,17.7,17.7,0,0,1-7.8-3.8c-7.8-6.6-8.5-18.7-1.5-27S76.4,52.2,84.2,58.8Z" fill="none" stroke="#ffffff" stroke-miterlimit="10" stroke-width="2"/>
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    <line class="trail drawPath" x1="61.8" y1="45.8" x2="16.9" y2="1" fill="none" stroke="#ffffff" stroke-linecap="round" stroke-miterlimit="10" stroke-width="2"/>
    <path class="drawPath" d="M31.5,15.5" fill="none" stroke="#000" stroke-linecap="round" stroke-miterlimit="10" stroke-width="2"/>
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  </g>
</symbol>

<symbol id="galaxy" viewBox="0 -2 110 115">
  <g>
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    <path class="drawPath" class="drawPath" d="M86,98.5a71.2,71.2,0,0,1-10.6.4" fill="none" stroke="#000" stroke-linecap="round" stroke-miterlimit="10" stroke-width="2"/>
    <path class="drawPath" d="M118,57.4c-2.7,15.1-16.4,27-37.1,29.8-24.2,3.3-51-9.9-59.8-29.4C13.8,42,23.9,27,43.5,24.3,59.5,22.2,77.1,30.9,83,43.8c4.8,10.5-1.3,22.1-14.8,22.1-11.2,0-20.4-5.3-23.6-12.2" fill="none" stroke="#000" stroke-linecap="round" stroke-miterlimit="10" stroke-width="2"/>
    <path class="drawPath" d="M115,36.5a40,40,0,0,1,2.9,8.9" fill="none" stroke="#000" stroke-linecap="round" stroke-miterlimit="10" stroke-width="2"/>
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  <symbol viewbox="0 0 100 100" id="star-1">
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  </symbol>
  <symbol viewbox="0 0 110 110" id="star-2">
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      <symbol viewbox="0 0 50 50" id="star-3">
   <path d="M25.3,2.2l3.9,15a1.6,1.6,0,0,0,1.1,1.1l15,3.9a1.6,1.6,0,0,1,0,3l-15,3.9a1.6,1.6,0,0,0-1.1,1.1l-3.9,15a1.6,1.6,0,0,1-3,0l-3.9-15a1.6,1.6,0,0,0-1.1-1.1l-15-3.9a1.6,1.6,0,0,1,0-3l15-3.9a1.6,1.6,0,0,0,1.1-1.1l3.9-15A1.6,1.6,0,0,1,25.3,2.2Z" fill="white" stroke="#fff" stroke-miterlimit="10" stroke-width="4"/>
    </symbol>
  
</svg>


<div class="stars-wrapper">
  <div id='stars'></div>
  <div id='stars2'></div>
  <div id='stars3'></div>
</div>
<div id="main-wrapper"></div>
<div id="toggle-wrapper">
  <div>
  <p>animations</p>
<div class="toggle-container">
  <input type="checkbox" id="toggle"/>
  <label for="toggle" class="toggle">
    <div class="toggle-handler">
<svg  viewBox="0 0 103 105" class="moon-toggle">
  <g>    
  <circle cx="51" cy="51" r="50" fill="none"  stroke-miterlimit="10" stroke-width="2"/>
    <circle cx="22.5" cy="43.5" r="6.4" fill="none" stroke="#000" stroke-miterlimit="10" stroke-width="2"/>
    <circle cx="78.3" cy="42.4" r="12.1" fill="none" stroke="#000" stroke-miterlimit="10" stroke-width="2"/>
    <circle cx="53.2" cy="74.3" r="7.3" fill="none" stroke="#000" stroke-miterlimit="10" stroke-width="2"/>
  </g>
  </svg>
      </div>
  </label>
  </div>
</div>
</div>
!

CSS 

              
                html,
body {
  height: 100%;
  width: 100%;
  overflow: hidden;
  background: #150d35;
  padding: 0;
  margin: 0;
}
* {
  box-sizing: border-box;
}
body {
  background: #81a6e0;
  background: linear-gradient(to bottom, #81a6e0 0%, #cc7bc5 100%);
}

svg {
  opacity: 1;
}
svg.hide {
  diplay: none;
}

svg * {
  stroke: inherit;
  transform: inherit;
  transform-origin: inherit;
  animation-delay: inherit;
  stroke: #ffffff;
  // stroke-width:inherit;
}

svg {
  width: 80px;
  height: 60px;
  margin: 10px;
  opacity: 0.9;
  position: absolute;
}
svg.star {
  width: 12px;
  height: 12px;
  opacity: 0.4;
}
.stars-wrapper {
  opacity: 0.6;
  width: 100%;
  height: 100%;
  position: absolute;
}
#main-wrapper {
  width: 100%;
  height: 100%;
  position: absolute;
}

// toggle
@import url("https://fonts.googleapis.com/css?family=Kodchasan:700");
$pink: #BF85CB;
$purple: #81A6E0;

#toggle-wrapper {
  width: 280px;
  height: 160px;
  position: absolute;
  background-color: rgba(255, 255, 255, 0.8);
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  border-radius: 0 0 5px 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Kodchasan", Arial, sans-serif;
  font-size: 18px;
  letter-spacing: 2px;
  color: #81a6e0;
  p {
    margin-top: 0;
  }
}


.toggle-container {
  display: flex;
  flex-direction: column;
  margin-left: 12px;
}
input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    left: -99em;
}
.toggle {
  cursor: pointer;
  position: relative;
  width: 100px;
  height: 50px;
  background-color: $purple;
  border-radius: 30px;
  transition: background-color 0.2s cubic-bezier(0.6, 0, 0.2, 1);
  &:before,
  &:after {
    position: absolute;
    top: 15px;
  }
  &:before {
    content: "OFF";
    left: -58px;
    color: $pink;
  }
  &:after {
    content: "ON";
    right: -48px;
    color: $purple;
  }
}
.moon-toggle {
  margin:0;
  width: 100%;
  height: 100%;
  transform: rotate(95deg);
  transform-origin: 50% 50%;
  transition: all 0.5s cubic-bezier(0.6, 0, 0.2, 1);
}
.toggle-handler {
  margin: 0;
  position: relative;
  top: 3px;
  left: 3px;
  width: 44px;
  height: 44px;
  border-radius: 30px;
  box-shadow: 0px 2px 5px rgba(0, 0, 0, 0.2);
  transition: all 0.5s cubic-bezier(0.6, 0, 0.2, 1);
}

input:checked {
  + .toggle {
    background-color: $pink;

    &:before {
      color: $purple;
    }
    &:after {
      color: $pink;
    }
    .toggle-handler {
      transform: translateX(50px);
    }
    .moon-toggle {
      transform: rotate(0deg);
    }
  }
}

// Starts by Saransh Sinha
// https://codepen.io/saransh/pen/BKJun

@function multiple-box-shadow ($n) {
  $value: "#{random(2000)}px #{random(2000)}px #FFF";
  @for $i from 2 through $n {
    $value: "#{$value} , #{random(2000)}px #{random(2000)}px #FFF";
  }

  @return unquote($value);
}

$shadows-small: multiple-box-shadow(700);
$shadows-medium: multiple-box-shadow(200);
$shadows-big: multiple-box-shadow(100);

#stars {
  width: 1px;
  height: 1px;
  background: transparent;
  box-shadow: $shadows-small;
  animation: animStar 50s linear infinite;

  &:after {
    content: " ";
    position: absolute;
    top: 2000px;
    width: 1px;
    height: 1px;
    background: transparent;
    box-shadow: $shadows-small;
  }
}

#stars2 {
  width: 2px;
  height: 2px;
  background: transparent;
  box-shadow: $shadows-medium;
  animation: animStar 100s linear infinite;

  &:after {
    content: " ";
    position: absolute;
    top: 2000px;
    width: 2px;
    height: 2px;
    background: transparent;
    box-shadow: $shadows-medium;
  }
}

#stars3 {
  width: 3px;
  height: 3px;
  background: transparent;
  box-shadow: $shadows-big;
  animation: animStar 150s linear infinite;
}

@keyframes animStar {
  from {
    transform: translateY(0px);
  }
  to {
    transform: translateY(-2000px);
  }
}
!

JS 

              
                let w = window.innerWidth;
let h = window.innerHeight;
let animated = false;

const select = function(el) {
  return document.getElementById(el);
};

const wrapper = select("main-wrapper");
const checkBox = select("toggle");
const images = [
  { id: "#planet-1", name:"planet-1" },
  { id: "#planet-2", name:"planet-2" },
  { id: "#moon-crescent", name:"moon-crescent" },
  { id: "#moon-full", name:"moon-full" },
  { id: "#constellation", name:"constellation" },
  { id: "#comet", name:"comet" },
  { id: "#galaxy", name:"galaxy" }
];
const stars = ["#star-1", "#star-2", "#star-3"];

checkBox.addEventListener("change", checkStatus);

window.addEventListener("resize", function() {
  w = window.innerWidth;
  h = window.innerHeight;
  init();
});

// building the pattern
function El(image, x, y, delay) {
  this.image = image;
  this.x = x;
  this.y = y;
  this.delay = delay;
}

El.prototype.attach = function() {
  this.svg = document.createElementNS("http://www.w3.org/2000/svg", "svg");
  this.use = document.createElementNS("http://www.w3.org/2000/svg", "use");
  this.use.setAttributeNS(
    "http://www.w3.org/1999/xlink",
    "xlink:href",
    this.image.id
  );
  this.svg.setAttribute("xmlns:xlink", "http://www.w3.org/1999/xlink");
  this.svg.setAttribute(
    "style",
    "top: " +
      this.y +
      "px; left: " +
      this.x +
      "px; animation-delay: " +
      this.delay +
      "s;"
  );
};

function Star(image, x, y) {
  this.image = image;
  this.x = x;
  this.y = y;
}

Star.prototype.attach = function() {
  this.svg = document.createElementNS("http://www.w3.org/2000/svg", "svg");
  this.use = document.createElementNS("http://www.w3.org/2000/svg", "use");
  this.use.setAttributeNS(
    "http://www.w3.org/1999/xlink",
    "xlink:href",
    this.image
  );
  this.svg.setAttribute("xmlns:xlink", "http://www.w3.org/1999/xlink");
  this.svg.setAttribute(
    "style",
    "top: " + this.y + "px; left: " + this.x + "px;"
  );
  this.svg.setAttribute("class", "star");
};

const spacing = 130;
let i, s;

function init() {
  while (wrapper.firstChild) {
    wrapper.removeChild(wrapper.firstChild);
  }
  i = 0;
  s = 0;

  for (let y = 0; y <= h; y += spacing) {
    if (y % (spacing * 2) === 0) {
      for (let x = 0; x <= w; x += spacing) {
        if (x % (spacing * 2) === 0) {
          draw(x, y + 10);
        } else {
          draw(x, y - 10);
        }
      }
    } else {
      for (let x = -(spacing / 2); x <= w; x += spacing) {
        if ((x + spacing / 2) % (2 * spacing) === 0) {
          draw(x, y + 10);
        } else {
          draw(x, y - 10);
        }
      }
    }
  }
  const newSpacing = spacing - 40;
  for (let y = newSpacing; y <= h; y += spacing) {
    for (let x = -(spacing / 2); x <= w; x += spacing) {
      if ((x + spacing / 2) % (2 * spacing) === 0) {
        drawStar(x, y + 10);
      } else {
        drawStar(x, y - 10);
      }
    }
  }
}

function draw(x, y) {
  const image = images[i];
  const delay = Math.floor(Math.random() * 2);
  const el = new El(image, x, y, delay);
  if (i === images.length - 1) {
    i = 0;
  } else {
    i++;
  }
  el.attach();
  el.svg.appendChild(el.use);
  wrapper.appendChild(el.svg);
}

function drawStar(x, y) {
  const image = stars[s];
  const star = new Star(image, x, y);
  if (s === stars.length - 1) {
    s = 0;
  } else {
    s++;
  }
  star.attach();
  star.svg.appendChild(star.use);
  wrapper.appendChild(star.svg);
}

init();

// animation functions
const moonFull = document.querySelector("symbol#moon-full");
const galaxy = document.querySelector("symbol#galaxy");
const planet1 = document.querySelector("symbol#planet-1");
const planet2 = document.querySelector("symbol#planet-2");
const moonCrescent = document.querySelector("symbol#moon-crescent");
const comet = document.querySelector("symbol#comet");
const constellationStars = document.querySelectorAll(
  "symbol#constellation polygon"
);
let cometLines = document.querySelectorAll("symbol#comet .trail");

const tlMoonFull = new TimelineMax({ repeat: -1, paused: true });
tlMoonFull.to(moonFull, 20, { rotation: 360, ease: Power0.easeNone });

const tlGalaxy = new TimelineMax({ repeat: -1, yoyo: true, paused: true });
tlGalaxy.to(galaxy, 5, { rotationX: -45, ease: Power0.easeNone });

const tlPlanet1 = new TimelineMax({ repeat: -1, yoyo: true, paused: true });
tlPlanet1
  .to(planet1, 2, { rotation: 7, ease: Power0.easeNone })
  .to(planet1, 2, { rotation: -2, ease: Power0.easeNone });

const tlPlanet2 = new TimelineMax({ repeat: -1, yoyo: true, paused: true });
tlPlanet2.to(planet2, 0.5, { x: 1, y: 1, ease: Power0.easeNone });

const tlComet = new TimelineMax({ repeat: -1, yoyo: true, paused: true });
const tlCometTrail = new TimelineMax({ repeat: -1, yoyo: true, paused: true });
tlComet.to(comet, 0.15, { x: 1, y: 1, ease: Power0.easeNone });
cometLines.forEach((el, i) => {
  const x2 = parseInt(el.getAttribute("x2")) - 10;
  const y2 = parseInt(el.getAttribute("y2")) - 10;
  let tl = new TimelineMax({ repeat: -1, yoyo: true });
  tl.to(el, 1, { attr: { x2: x2, y2: y2 }, ease: Linear.easeNone });
  tlCometTrail.add(tl, i / 2);
});

const tlMoonCrescent = new TimelineMax({
  repeat: -1,
  yoyo: true,
  paused: true
});
tlMoonCrescent
  .to(moonCrescent, 2, { rotation: 5, ease: Power0.easeNone })
  .to(moonCrescent, 2, { rotation: -5, ease: Power0.easeNone });

const tlConstellation = new TimelineMax({ repeat: -1, paused: true });
constellationStars.forEach((el, i) => {
  var tl = new TimelineMax({ repeat: -1, yoyo: true });
  tl.to(el, 1, { opacity: 0.3, ease: Linear.easeNone });
  tlConstellation.add(tl, i);
});

function checkStatus() {
  if (checkBox.checked) {
    animated = true;
    startAnimation();

  } else {
    animated = false;
    stopAnimation();
  }
}

function startAnimation() {
  tlMoonFull.play();
  tlMoonCrescent.play();
  tlPlanet1.play();
  tlPlanet2.play();
  tlGalaxy.play();
  tlComet.play();
  tlCometTrail.play();
  tlConstellation.play();
  planet1DrawTl.play();
  planet2DrawTl.play();
  moonFullDrawTl.play();
  moonCrescentDrawTl.play();
  galaxyDrawTl.play();
  constellationDrawTl.play();
  cometDrawTl.play();
}

function stopAnimation() {
  tlMoonFull.pause();
  tlMoonCrescent.pause();
  tlPlanet1.pause();
  tlPlanet2.pause();
  tlGalaxy.pause();
  tlComet.pause();
  tlCometTrail.pause();
  tlConstellation.pause();
  planet1DrawTl.pause();
  planet2DrawTl.pause();
  moonFullDrawTl.pause();
  moonCrescentDrawTl.pause();
  galaxyDrawTl.pause();
  constellationDrawTl.pause();
  cometDrawTl.pause();
}


// images.map(el => {
//     const element = el.id + ' .drawPath';
//     const objectPaths = document.querySelectorAll(element);
//     const objectTl = new TimelineMax({repeat: -1, yoyo: true, paused: true});
//     const delay = Math.floor (Math.random() * 20) + 10;
//     const repeatDelay = Math.floor (Math.random() * 40) + 20;
//     // animating
//     objectPaths.forEach((path, i) => {
//       const tl = new TimelineMax({repeatDelay:repeatDelay, delay:delay, paused: false})
//       tl.to(path, 3, {drawSVG:"0%"});
//       objectTl.add(tl, i);
//     })
//   })

const planet1Draw = document.querySelectorAll('#planet-1 .drawPath');
const planet1DrawTl = new TimelineMax({repeat: -1, yoyo: true, paused: true});
planet1Draw.forEach((path, i) => {
  const tl = new TimelineMax({repeatDelay:40, delay:10})
  tl.to(path, 3, {drawSVG:"0%"});
  planet1DrawTl.add(tl, i);
})

const planet2Draw = document.querySelectorAll('#planet-2 .drawPath');
const planet2DrawTl = new TimelineMax({repeat: -1, yoyo: true, paused: true});
planet2Draw.forEach((path, i) => {
  const tl = new TimelineMax({repeatDelay:25, delay:45})
  tl.to(path, 3, {drawSVG:"0%"});
  planet2DrawTl.add(tl, i);
})

const cometDraw = document.querySelectorAll('#comet .drawPath');
const cometDrawTl = new TimelineMax({repeat: -1, yoyo: true, paused: true});
cometDraw.forEach((path, i) => {
  const tl = new TimelineMax({repeatDelay:10, delay:25})
  tl.to(path, 3, {drawSVG:"0%"});
  cometDrawTl.add(tl, i);
})

const moonFullDraw = document.querySelectorAll('#moon-full .drawPath');
const moonFullDrawTl = new TimelineMax({repeat: -1, yoyo: true, paused: true});
moonFullDraw.forEach((path, i) => {
  const tl = new TimelineMax({repeatDelay:30, delay:35})
  tl.to(path, 3, {drawSVG:"0%"});
  moonFullDrawTl.add(tl, i);
})
const galaxyDraw = document.querySelectorAll('#comet .drawPath');
const galaxyDrawTl = new TimelineMax({repeat: -1, yoyo: true, paused: true});
galaxyDraw.forEach((path, i) => {
  const tl = new TimelineMax({repeatDelay:35, delay:55})
  tl.to(path, 3, {drawSVG:"0%"});
  galaxyDrawTl.add(tl, i);
})
const moonCrescentDraw = document.querySelectorAll('#moon-crescent .drawPath');
const moonCrescentDrawTl = new TimelineMax({repeat: -1, yoyo: true, paused: true});
moonCrescentDraw.forEach((path, i) => {
  const tl = new TimelineMax({repeatDelay:22, delay:65})
  tl.to(path, 3, {drawSVG:"0%"});
  moonCrescentDrawTl.add(tl, i);
})
const constellationDraw = document.querySelectorAll('#constellation .drawPath');
const constellationDrawTl = new TimelineMax({repeat: -1, yoyo: true, paused: true});
constellationDraw.forEach((path, i) => {
  const tl = new TimelineMax({repeatDelay:28, delay:28})
  tl.to(path, 3, {drawSVG:"0%"});
  constellationDrawTl.add(tl, i);
})
!
999px

Console