A Peano (?) space-filling curve drawn with an implementation of an L-system renderer. I found the name on this page, but from Wikipedia I got another curve as Peano.
The drawing of the line is animated using Mike Bostock's stroke dash interpolation.
Modified http://d3js.org/d3.v3.min.js to a secure url
https://d3js.org/d3.v3.min.js