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HTML

              
                <div class="container">
  <svg class="svg-container" version="1.1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 500 200">
    <line class="line line--left" x1="10" y1="17" x2="10" y2="183"> </line>
    <line class="line line--rght" x1="490" y1="17" x2="490" y2="183"> </line>
    <g>
      <path class="lttr lttr--I" d="M42.2,73.9h11.4v52.1H42.2V73.9z"></path>
      <path class="lttr lttr--L" d="M85.1,73.9h11.4v42.1h22.8v10H85.1V73.9z"></path>
      <path class="lttr lttr--O" d="M123.9,100c0-15.2,11.7-26.9,27.2-26.9s27.2,11.7,27.2,26.9s-11.7,26.9-27.2,26.9S123.9,115.2,123.9,100zM166.9,100c0-9.2-6.8-16.5-15.8-16.5c-9,0-15.8,7.3-15.8,16.5s6.8,16.5,15.8,16.5C160.1,116.5,166.9,109.2,166.9,100z"> </path>
      <path class="lttr lttr--V" d="M180.7,73.9H193l8.4,22.9c1.7,4.7,3.5,9.5,5,14.2h0.1c1.7-4.8,3.4-9.4,5.2-14.3l8.6-22.8h11.7l-19.9,52.1h-11.5L180.7,73.9z"></path>
      <path class="lttr lttr--E" d="M239.1,73.9h32.2v10h-20.7v10.2h17.9v9.5h-17.9v12.4H272v10h-33V73.9z"></path>
      <path class="lttr lttr--Y" d="M315.8,102.5l-20.1-28.6H309l6.3,9.4c2,3,4.2,6.4,6.3,9.6h0.1c2-3.2,4.1-6.4,6.3-9.6l6.3-9.4h12.9l-19.9,28.5v23.6h-11.4V102.5z"></path>
      <path class="lttr lttr--O2" d="M348.8,100c0-15.2,11.7-26.9,27.2-26.9c15.5,0,27.2,11.7,27.2,26.9s-11.7,26.9-27.2,26.9C360.5,126.9,348.8,115.2,348.8,100z M391.8,100c0-9.2-6.8-16.5-15.8-16.5c-9,0-15.8,7.3-15.8,16.5s6.8,16.5,15.8,16.5C385,116.5,391.8,109.2,391.8,100z"></path>
      <path class="lttr lttr--U" d="M412.4,101.1V73.9h11.4v26.7c0,10.9,2.4,15.9,11.5,15.9c8.4,0,11.4-4.6,11.4-15.8V73.9h11v26.9c0,7.8-1.1,13.5-4,17.7c-3.7,5.3-10.4,8.4-18.7,8.4c-8.4,0-15.1-3.1-18.8-8.5C413.4,114.2,412.4,108.5,412.4,101.1z"></path>
    </g>
  </svg>
  <div class="mo-container"> </div>
</div>


<audio class="blup" style="display: none">
  <source src="https://www.freesound.org/data/previews/265/265115_4373976-lq.mp3" type="audio/ogg">
</audio >
<audio class="blop" style="display: none">
  <source src="https://www.freesound.org/data/previews/265/265115_4373976-lq.mp3" type="audio/ogg">
</audio>
<div class="sound">sound</div>
              
            
!

CSS

              
                @mixin flex-center() {
  display: flex;
  justify-content: center;
  align-items: center;
}

$col-bg: #FFC568;
$col-lttr: #763C8C;
$col-line: #FFFFFF;
$to-mobile: 520px;

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

html, body {
  min-height: 100vh;
  @include flex-center();
  
  background-color: $col-bg;
  font-size: 62.5%;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  
  @media screen and (max-width: $to-mobile) {
    /* don't know how to set default units to rem in mojs :(( */
  }
}

.container {
  width: 50rem;
  height: 20rem;
  position: relative;
}

.svg-container {
  z-index: 2;
  position: absolute;
}

.mo-container {
  width: 100%;
  height: 100%;
}


.line {
  fill: none;
  stroke: $col-line;
  stroke-width: 8;
  stroke-linecap: round;
  stroke-miterlimit: 10;
}

.lttr {
  fill: $col-lttr;
}

.sound {
  position: fixed;
  color: $col-lttr;
  font-size: 1.6rem;
  bottom: 1rem;
  right: 1rem;
  text-decoration: underline;
  cursor: default;
  &--off {
    text-decoration: line-through;
  }
}
              
            
!

JS

              
                const qs = document.querySelector.bind(document);
const easingHeart = mojs.easing.path('M0,100C2.9,86.7,33.6-7.3,46-7.3s15.2,22.7,26,22.7S89,0,100,0');

const el = {
  container: qs('.mo-container'),
  
  i: qs('.lttr--I'),
  l: qs('.lttr--L'),
  o: qs('.lttr--O'),
  v: qs('.lttr--V'),
  e: qs('.lttr--E'),
  y: qs('.lttr--Y'),
  o2: qs('.lttr--O2'),
  u: qs('.lttr--U'),
  
  lineLeft: qs('.line--left'),
  lineRight: qs('.line--rght'),
  
  colTxt: "#763c8c",
  colHeart: "#fa4843",
  
  blup: qs('.blup'),
  blop: qs('.blop'),
  sound: qs('.sound')
};

class Heart extends mojs.CustomShape {
  getShape() {
    return '<path d="M50,88.9C25.5,78.2,0.5,54.4,3.8,31.1S41.3,1.8,50,29.9c8.7-28.2,42.8-22.2,46.2,1.2S74.5,78.2,50,88.9z"/>';
  }
  getLength () { return 200; }
}
mojs.addShape('heart', Heart);

const crtBoom = (delay = 0, x = 0, rd = 46) => {
  parent = el.container;
  const crcl = new mojs.Shape({
    shape:        'circle',
    fill:         'none',
    stroke:        el.colTxt,
    strokeWidth:  { 5 : 0 },
    radius:       { [rd] : [rd + 20] },
    easing:       'quint.out',
    duration:     500 / 3,
    parent,
    delay,
    x
  });
  
  const brst = new mojs.Burst({
    radius:       { [rd + 15] : 110 },
    angle:        'rand(60, 180)',
    count:        3,
    timeline:     { delay },
    parent,
    x,
    children: {
      radius:       [5, 3, 7],
      fill:         el.colTxt,
      scale:        { 1: 0, easing: 'quad.in' },
      pathScale:    [ .8, null ],
      degreeShift:  [ 'rand(13, 60)', null ],
      duration:     1000 / 3,
      easing:       'quint.out'
    }
  });
  
  return [crcl, brst];
};

const crtLoveTl = () => {
  const move        = 1000;
  const boom        = 200;
  const easing      = 'sin.inOut';
  const easingBoom  = 'sin.in';
  const easingOut   = 'sin.out';
  const opts        = { duration: move, easing, opacity: 1 };
  const delta       = 150;
  
  return (new mojs.Timeline).add([
    new mojs.Tween({
      duration: move,
      onStart: () => {
        [el.i, el.l, el.o, el.v, el.e, el.y, el.o2, el.u].forEach(el => {
          el.style.opacity = 1;
          el.style = 'transform: translate(0px, 0px) rotate(0deg) skew(0deg, 0deg) scale(1, 1); opacity: 1;'
        })
      },
      onComplete: () => {
        [el.l, el.o, el.v, el.e].forEach(el => el.style.opacity = 0);
        el.blop.play();
      }
    }),
    
    new mojs.Tween({
      duration: move * 2 + boom,
      onComplete: () => {
        [el.y, el.o2].forEach(el => el.style.opacity = 0);
        el.blop.play();
      }
    }),
  
    new mojs.Tween({
      duration: move * 3 + boom * 2 - delta,
      onComplete: () => { 
        el.i.style.opacity = 0;
        el.blop.play();
      }
    }),
  
    new mojs.Tween({
      duration: move * 3 + boom * 2,
      onComplete: () => { 
        el.u.style.opacity = 0; 
        el.blup.play();
      }
    }),
  
    new mojs.Tween({
      duration: 50,
      delay: 4050,
      onUpdate: (progress) => {
        [el.i, el.l, el.o, el.v, el.e, el.y, el.o2, el.u].forEach(el => {
          el.style = `transform: translate(0px, 0px) rotate(0deg) skew(0deg, 0deg) scale(1, 1); opacity: ${1 * progress};`
        })
      },
      onComplete: () => {
        [el.i, el.l, el.o, el.v, el.e, el.y, el.o2, el.u].forEach(el => {
          el.style.opacity = 1;
          el.style = 'transform: translate(0px, 0px) rotate(0deg) skew(0deg, 0deg) scale(1, 1); opacity: 1;'
        })
      }
    }),
    
    new mojs.Html({
      ...opts,
      el: el.lineLeft,
      x: { 0 : 52 },
    }).then({
      duration: boom + move,
      easing,
      x: { to : 52 + 54 }
    }).then({
      duration: boom + move,
      easing,
      x: { to : 52 + 54 + 60 }
    }).then({
      duration: 150, // 3550
      easing,
      x: { to : 52 + 54 + 60 + 10 }
    }).then({
      duration: 300
    }).then({
      duration: 350,
      x: { to : 0 },
      easing: easingOut
    }),
    
    new mojs.Html({
      ...opts,
      el: el.lineRight,
      x: { 0 : -52 },
    }).then({
      duration: boom + move,
      easing,
      x: { to : -52 - 54 }
    }).then({
      duration: boom + move,
      easing,
      x: { to : -52 - 54 - 60 }
    }).then({
      duration: 150,
      easing,
      x: { to : -52 - 54 - 60 - 10 }
    }).then({
      duration: 300
    }).then({
      duration: 350,
      x: { to : 0 },
      easing: easingOut,
    }),
    
    new mojs.Html({ // [I] LOVE YOU
      ...opts,
      el: el.i,
      x: { 0 : 34 },
    }).then({
      duration: boom,
      easing: easingBoom,
      x: { to : 34 + 19 }
    }).then({
      duration: move,
      easing,
      x: { to : 34 + 19 + 40 }
    }).then({
      duration: boom,
      easing: easingBoom,
      x: { to : 34 + 19 + 40 + 30 }
    }).then({
      duration: move,
      easing,
      x: { to : 34 + 19 + 40 + 30 + 30 }
    }),
    
    new mojs.Html({ // I [L]OVE YOU
      ...opts,
      el: el.l,
      x: { 0 : 15 },
    }),
    
    new mojs.Html({ // I L[O]VE YOU
      ...opts,
      el: el.o,
      x: { 0 : 11 },
    }),
    
    new mojs.Html({ // I LO[V]E YOU
      ...opts,
      el: el.v,
      x: { 0 : 3 },
    }),
    
    new mojs.Html({ // I LOV[E] YOU
      ...opts,
      el: el.e,
      x: { 0 : -3 },
    }),
    
    new mojs.Html({ // I LOVE [Y]OU
      ...opts,
      el: el.y,
      x: { 0 : -20 },
    }).then({
      duration: boom,
      easing: easingBoom,
      x: { to : -20 - 33}
    }).then({
      duration: move,
      easing,
      x: { to : -20 - 33 - 24 }
    }),
    
    new mojs.Html({ // I LOVE Y[O]U
      ...opts,
      el: el.o2,
      x: { 0 : -27 },
    }).then({
      duration: boom,
      easing: easingBoom,
      x: { to : -27 - 27}
    }).then({
      duration: move,
      easing,
      x: { to : -27 - 27 - 30 }
    }),
    
    new mojs.Html({ // I LOVE YO[U]
      ...opts,
      el: el.u,
      x: { 0 : -32 },
    }).then({
      duration: boom,
      easing: easingBoom,
      x: { to : -32 - 21}
    }).then({
      duration: move,
      easing,
      x: { to : -32 - 21 - 36 }
    }).then({
      duration: boom,
      easing: easingBoom,
      x: { to : -32 - 21 - 36 - 31 }
    }).then({
      duration: move,
      easing,
      x: { to : -32 - 21 - 36 - 31 - 27 }
    }),
    
    new mojs.Shape({
      parent: el.container,
      shape: 'heart',
      delay: move,
      fill: el.colHeart,
      x: -64,
      scale: { 0 : 0.95, easing: easingHeart },
      duration: 500
    }).then({
      x: { to : -62, easing },
      scale: { to : 0.65, easing },
      duration: boom + move - 500,
    }).then({
      duration: boom - 50,
      x: { to: -62 + 48 },
      scale: { to : 0.90 },
      easing: easingBoom
    }).then({
      duration:  125,
      scale: { to : 0.8 },
      easing: easingOut
    }).then({
      duration:  125,
      scale: { to : 0.85 },
      easing: easingOut
    }).then({
      duration: move - 200,
      scale: { to : 0.45 },
      easing
    }).then({
      delay: -75,
      duration: 150,
      x: { to: 0 },
      scale: { to : 0.90 },
      easing: easingBoom
    }).then({
      duration:  125,
      scale: { to : 0.8 },
      easing: easingOut
    }).then({
      duration:  125, // 3725
      scale: { to : 0.85 },
      easing: easingOut
    }).then({
      duration: 125, // 3850
    }).then({
      duration: 350,
      scale: { to : 0 },
      easing: easingOut
    }),
    
    ...crtBoom(move, -64, 46),
    ...crtBoom(move * 2 + boom, 18, 34),
    ...crtBoom(move * 3 + boom * 2 - delta, -64, 34),
    ...crtBoom(move * 3 + boom * 2, 45, 34)
  ]);
};

const loveTl = crtLoveTl().play();
setInterval(() => { loveTl.replay() }, 4300);

const volume = 0.2;
el.blup.volume = volume;
el.blop.volume = volume;

const toggleSound = () => {
  let on = true;
  return () => {
    if (on) {
      el.blup.volume = 0.0;
      el.blop.volume = 0.0;
      el.sound.classList.add('sound--off')
    }
    else {
      el.blup.volume = volume;
      el.blop.volume = volume;
      el.sound.classList.remove('sound--off')
    }
    on = !on;
  }
}
el.sound.addEventListener('click', toggleSound());
              
            
!
999px

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