Animated D3 Logo

Animating the D3 logo as if it were being drawn by hand.

<!DOCTYPE html>
<meta charset="utf-8">
<style>

.fill {
  fill: #ccc;
}

.stroke {
  fill: none;
  stroke: #000;
  stroke-width: 20px;
}

</style>
<svg width="960" height="500" viewBox="-10 -10 116 111">
  <defs>
    <path id="dee" d="M0,0h7.75a45.5,45.5 0 1 1 0,91h-7.75v-20h7.75a25.5,25.5 0 1 0 0,-51h-7.75z"/>
    <path id="three" d="M36.2510,0h32a27.75,27.75 0 0 1 21.331,45.5a27.75,27.75 0 0 1 -21.331,45.5h-32a53.6895,53.6895 0 0 0 18.7464,-20h13.2526a7.75,7.75 0 1 0 0,-15.5h-7.75a53.6895,53.6895 0 0 0 0,-20h7.75a7.75,7.75 0 1 0 0,-15.5h-13.2526a53.6895,53.6895 0 0 0 -18.7464,-20z"/>
    <clipPath id="clip-three">
      <use xlink:href="#three"/>
    </clipPath>
  </defs>
  <use class="fill" xlink:href="#dee"/>
  <use class="fill" xlink:href="#three"/>
  <path class="stroke" style="display:none;" d="M0,10h7.75a35.5,35.5 0 1 1 0,71h-7.75"/>
  <path class="stroke" style="display:none;" clip-path="url(#clip-three)" d="M36.2510,10h32a17.75,17.75 0 0 1 0,35.5h-7.75h7.75a17.75,17.75 0 0 1 0,35.5h-32"/>
</svg>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>

d3.select(this)
    .on("touchstart", animate)
    .on("click", animate)
    .on("load", animate);

function animate() {
  var delay = 0,
      stroke = d3.selectAll(".stroke");

// First cancel any active or scheduled transitions.
  stroke.interrupt().transition();

// Then schedule the new transition.
  stroke.transition().each(function() {
    var length = this.getTotalLength(),
        duration = length * 20;

d3.select(this)
        .style("display", null)
        .style("stroke-dasharray", "0," + length)
      .transition()
        .delay(delay)
        .duration(duration)
        .style("stroke-dasharray", length + "," + length);

delay += duration;
  });
}

</script>

https://d3js.org/d3.v3.min.js