<command arg="-root"/>
+ <video href="https://www.youtube.com/watch?v=rpk3zxQxaR8"/>
+
<number id="delay" type="slider" arg="-delay %"
_label="Frame rate" _low-label="Low" _high-label="High"
low="0" high="100000" default="20000"
circle. That circle rotates around a point on the rim of another
circle, and so on, several times.
-http://en.wikipedia.org/wiki/Deferent_and_epicycle
+https://en.wikipedia.org/wiki/Deferent_and_epicycle
Written by James Youngman; 1998.
</_description>