[csswg-drafts] [motion-path] Offset-rotate and zero length paths

karip has just created a new issue for 
https://github.com/w3c/csswg-drafts:

== [motion-path] Offset-rotate and zero length paths ==
The [Motion Paths Level 1 
offset-rotate](https://drafts.fxtf.org/motion-1/#offset-rotate-property)
 should define what is the directional tangent vector of a zero length
 path. Google Chrome seems to use value 0 in those cases, as shown by 
this example: https://jsfiddle.net/v4jo88mh/1/

The spec could also have a note saying that zero length **subpaths** 
are ignored when calculating the distance or rotation. Here's an 
example of a zero length subpath: https://jsfiddle.net/wnc1fht4/


Please view or discuss this issue at 
https://github.com/w3c/csswg-drafts/issues/971 using your GitHub 
account