<command arg="-root"/>
+ <video href="https://www.youtube.com/watch?v=fmHl17ppgc0"/>
+
<number id="delay" type="slider" arg="-delay %"
_label="Frame rate" _low-label="Low" _high-label="High"
low="0" high="100000" default="30000"
Slinky-like creatures walk down an infinite staircase and
occasionally explode!
-http://en.wikipedia.org/wiki/Slinky
-http://en.wikipedia.org/wiki/Q%2Abert
-http://en.wikipedia.org/wiki/Marble_Madness
+https://en.wikipedia.org/wiki/Slinky
+https://en.wikipedia.org/wiki/Q%2Abert
+https://en.wikipedia.org/wiki/Marble_Madness
Written by Ed Mackey; 1997.
</_description>