Interactive and animated SVG and <canvas> using plain JavaScript

Animated GIF.

Fig.1.
Wikimedia Commons resource: File:Pi-unrolled-720.gif (the GIF is 142 kB).

SVG animation.

Fig.2. pi.svg (8 kB)

Interactive <canvas>

y = ax2+bx+c



Your browser does not support the canvas element.
Fig.3. Parabola.
3D function.
Fig.4. Another example is this interactive 3D function plot