With this particular SVG snippet, Alexandr Izumenko has recreated the gooey circular spinner from a dribbble shot by Misha Heesakkers. The circle splits up into three smaller circles then does a circular loop them merges back to a bigger circle.
If you are having trouble with the pen, try the archived copy on GitHub
Gooey Circular Spinner Snippet
See the Pen Gooey loader by Alexandr Izumenko (@Izumenko) on CodePen.0