canvas smoke effect .. just like in this site.

canvas smoke effect .. just like in this site.

I wanted to create a smoke effect just like this one HERE. 

so i checked the dev tools and there is this element below:

  1. <canvas id="glRenderer" width="1366" height="591" style="width: 1366px; height: 591px; transform: scale(1); transform-origin: left top 0px;"></canvas>
But when i do ctrl+u and check the source and all the corresponding JS files , i see no id with the following name:

  1. glRenderer
or even canvas , so how is this effect being created ??

I would really appreciate if somebody could point me in the right direction.

Thank you.
Gautam.