<command arg="-root"/>
- <video href="http://www.youtube.com/watch?v=6EBNCXcD9f0"/>
+ <video href="https://www.youtube.com/watch?v=6EBNCXcD9f0"/>
<hgroup>
<vgroup>
Lissajous loops. This one draws the progress of circular shapes along a path.
-http://en.wikipedia.org/wiki/Lissajous_curve
+https://en.wikipedia.org/wiki/Lissajous_curve
Written by Alexander Jolk; 1997.
</_description>