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              <link href="https://fonts.googleapis.com/css?family=Source+Sans+Pro" rel="stylesheet">
<div class="pen">
  <h1>Timeline playground</h1>
  <a href="https://popmotion.io/api/timeline" target="blank">View docs</a>
  <button class="open-modal">Open modal</button>
  <div class="modal-shade"></div>
  <div class="modal-container">
    <div class="modal">
      <h1>Pay attention!</h1>
      <p>Just kidding, this dialog is entirely for demonstration purposes.</p>
      <div class="modal-actions">
        <button class="modal-cancel">Cancel</button>
        <button class="modal-ok">Ok!</button>
      </div>
    </div>
  </div>
</div>
<a class="created-by" target="_blank" href="https://popmotion.io">
  Pen created with
  <svg class="logo" width="125" height="25" viewBox="0 0 200 41">
    <defs>
      <linearGradient x1="50%" y1="0%" x2="50%" y2="100%" id="popmotion-gradient">
        <stop stop-color="#FF1C68" offset="0%"/>
        <stop stop-color="#FF1C68" offset="100%"/>
      </linearGradient>
    </defs>
    <path
          fill="url(#popmotion-gradient)"
          d="M15.65.85c6.3 0 9.6 4.17 9.6 9.4 0 5.93-4.3 11.33-11.78 11.33H8.8l-1.04 10.2H.28L3.48.85h12.17zm-5.4 7.03l-.77 7.03h4.26c2.54 0 4.04-1.67 4.04-3.9 0-1.58-1-3.12-3.13-3.12h-4.4zM23.36 21.85c0-7 5.85-12.2 12.8-12.2 5.98 0 10.65 4.4 10.65 10.43 0 7.03-6.02 12.15-12.78 12.15-6.12 0-10.66-4.35-10.66-10.38zm16.28-1.27c0-2.4-1.58-4.4-4.03-4.4-2.85 0-5.03 2.4-5.03 5.2 0 2.33 1.55 4.32 4 4.32 2.9 0 5.07-2.4 5.07-5.12zM55.66 10.1l.1 2.3s1.86-2.75 6.12-2.75c4.94 0 8.8 4.17 8.8 10.25 0 7.03-5.36 12.33-11.02 12.33-3.9 0-5.5-2.35-5.5-2.35l-1.13 10.97h-7.2l3.2-30.75h6.63zm8 10.3c0-2.32-1.55-4.22-4.14-4.22-2.77 0-4.13 2.18-4.13 2.18l-.55 5.12s.9 2.18 3.67 2.18c2.95 0 5.13-2.45 5.13-5.26zM91.18 31.78h-7.2l1.35-12.8c0-.13.05-.4.05-.67 0-1.26-.64-1.98-1.95-1.98-1.68 0-3.54 1.67-3.54 1.67l-1.46 13.78h-7.2L73.5 10.1h6.8l.1 2.18s2.98-2.54 6.3-2.54c3.53 0 4.66 2.63 4.66 2.63s3.27-2.63 6.94-2.63c4.86 0 7.08 2.72 7.08 7.12 0 .54-.05 1.13-.1 1.68l-1.35 13.24H96.7l1.33-12.38c.05-.45.05-.64.05-.9 0-1.5-.77-2.18-1.95-2.18-1.77 0-3.5 1.72-3.5 1.72l-1.45 13.74M106.16 21.85c0-7 5.85-12.2 12.8-12.2 5.98 0 10.65 4.4 10.65 10.43 0 7.03-6.02 12.15-12.78 12.15-6.13 0-10.66-4.35-10.66-10.38zm16.28-1.27c0-2.4-1.6-4.4-4.03-4.4-2.85 0-5.03 2.4-5.03 5.2 0 2.33 1.54 4.32 4 4.32 2.9 0 5.07-2.4 5.07-5.12zM140.4 10.1l.5-4.76h-7.2l-.5 4.76h-3.13l-.68 6.53h3.12l-1.6 15.15h7.23l1.58-15.15h5.18l-1.57 15.15h7.26l2.25-21.68H140.4M146.46.9l-.64 6.16h7.5l.62-6.16h-7.48M153.05 21.85c0-7 5.85-12.2 12.8-12.2 5.97 0 10.65 4.4 10.65 10.43 0 7.03-6.04 12.15-12.8 12.15-6.12 0-10.65-4.35-10.65-10.38zm16.28-1.27c0-2.4-1.6-4.4-4.04-4.4-2.86 0-5.04 2.4-5.04 5.2 0 2.33 1.54 4.32 4 4.32 2.9 0 5.07-2.4 5.07-5.12zM198 31.78h-7.2l1.26-12.02c.05-.4.05-.63.05-.95 0-1.5-.76-2.62-2.62-2.62-2.4 0-4.36 1.95-4.36 1.95l-1.4 13.65h-7.2l2.25-21.68h6.9v2.3s2.9-2.7 6.44-2.7c3.95 0 7.3 2.53 7.3 7.75 0 .4-.04 1-.08 1.5L198 31.77"
          />
  </svg>
</a>
            
          
!
            
              body {
  --pink: #FF1C68;
  --green: #14D790;
  --blue: #198FE3;
  --black: #21282D;
  --purple: #9B65DE;
  color: #222;
  font-family: 'PT Sans', sans-serif;
  height: 100vh;
  padding: 0;
  margin: 0;
  display: flex;
  justify-content: center;
  flex-direction: column;
}

.pen {
  flex: 1 1 100%;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  flex-direction: column;
  margin: 0 auto;
  flex: 1 1 100%;
  width: 100%;
  max-width: 600px;
  padding: 0 20px;
}

.created-by {
  flex: 0 0 50px;
  background: #fff;
  color: #222;
  text-decoration: none;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  padding-right: 30px;
}

.logo {
  margin-left: 10px;
}

h1 {
  font-size: 32px;
  line-height: 28px;
  margin-bottom: 10px;
}

button {
  cursor: pointer;
  color: white;
  background-color: var(--blue);
  font-size: 24px;
  border: none;
  padding: 20px 25px;
}

.modal-cancel {
  background-color: white;
  color: var(--pink);
}

.modal-ok {
  background-color: var(--green);
}

.modal-shade {
  display: none;
  opacity: 0;
  background: radial-gradient(circle at center, rgba(0, 0, 0, 0.4) 0, rgba(0,0,0,0.8) 100%);
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  bottom: 0;
  will-change: opacity;
}

.modal-container {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  bottom: 0;
  display: none;
  justify-content: center;
  align-items: center;
  
  .modal {
    opacity: 0;
    box-shadow: 0 10px 50px rgba(0, 0, 0, 0.3);
    background: white;
    border-radius: 5px;
    padding: 30px 45px;
    width: 400px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
  }
  
  .modal-actions { 
    align-self: flex-end;
  }
}

.pen a {
  color: var(--blue);
  text-decoration: none;
  margin-bottom: 70px;
}

.balls {
  display: flex;
  align-items: stretch;
  height: 75px;
  position: relative;
  
  .ball {
    background: var(--purple);
    border-radius: 50%;
    margin-right: 15px;
    flex: 0 0 75px;

    &:nth-child(4n + 2) {
      background: var(--green);
    }

    &:nth-child(4n + 3) {
      background: var(--pink);
    }

    &:nth-child(4n + 4) {
      background: var(--blue);
    }
  }
}

            
          
!
            
              const { styler, timeline, listen, easing } = window.popmotion;

const openModalButton = document.querySelector('.open-modal');
const cancelModalButton = document.querySelector('.modal-cancel');
const okModalButton = document.querySelector('.modal-ok');

const modalShade = styler(document.querySelector('.modal-shade'));
const modalContainer = styler(document.querySelector('.modal-container'));
const modal = styler(document.querySelector('.modal'));
const modalSections = Array.from(document.querySelector('.modal').children).map(styler);
const sectionLabels = modalSections.map((s, i) => 'section' + i);

const tweenUp = (track, duration = 500, yFrom = 100) => ({
  track,
  duration,
  from: { y: yFrom, opacity: 0 },
  to: { y: 0, opacity: 1 },
  ease: { y: easing.backOut, opacity: easing.linear }
});

const setStylers = (v) => {
  if (v.shade !== undefined) modalShade.set('opacity', v.shade);
  if (v.modal !== undefined) modal.set(v.modal);
  sectionLabels.forEach((label, i) => {
    if (v[label] !== undefined) modalSections[i].set(v[label])
  });
};

const showContainers = () => {
  modalShade.set('display', 'block');
  modalContainer.set('display', 'flex');
};

const hideContainers = () => {
  modalShade.set('display', 'none');
  modalContainer.set('display', 'none');
};

const openModal = () => {
  showContainers();
  
  timeline([
    { track: 'shade', from: 0, to: 1, ease: easing.linear },
    '-100',
    tweenUp('modal'),
    '-200',
    [...modalSections.map((s, i) => tweenUp(sectionLabels[i], 300, 50)), 50]
  ]).start(setStylers);
}

const cancelModal = () => {
  timeline([
    {
      track: 'modal',
      duration: 200,
      from: { y: 0, opacity: 1 },
      to: { y: 100, opacity: 0 },
      ease: { y: easing.easeIn, opacity: easing.linear }
    },
    '-100',
    { track: 'shade', from: 1, to: 0, ease: easing.linear, duration: 200 }
  ]).start({
    update: setStylers,
    complete: hideContainers
  });
}

const okModal = () => {
  timeline([
    {
      track: 'modal',
      duration: 200,
      from: { y: 0, opacity: 1 },
      to: { y: -200, opacity: 0 },
      ease: { y: easing.easeOut, opacity: easing.linear }
    },
    '-100',
    { track: 'shade', from: 1, to: 0, ease: easing.linear, duration: 300 }
  ]).start({
    update: setStylers,
    complete: hideContainers
  });
}

listen(openModalButton, 'click').start(openModal);
listen(cancelModalButton, 'click').start(cancelModal);
listen(okModalButton, 'click').start(okModal);

            
          
!
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