75 Years of Batman logos

<!DOCTYPE html>
<head>
  <meta charset="UTF-8">
  <title>I'm...Batman</title>
</head>

function mainfn(xml) {
      var paths = Array.from(xml.getElementsByTagName('path'))
            .map(d => d.getAttribute('d'))
            .reverse()
      ;
      d3.select("path#batlogo")
          .call(animate)
      ;

function animate(sel) {
          var start = paths.shift()
            , end = paths[0];
          paths.push(start);

sel.datum({start, end})
            .transition()
              .duration(1500)
              .ease(d3.easeQuad)
              .attrTween("d", function(d) {
                  return d3.interpolate(d.start, d.end);
                })
              .on("end", function() { sel.call(animate); });
      } // animate()
  } // mainfn()

</script>

https://d3js.org/d3.v5.min.js