Remove <<zero>>.
Merge with removal of image-set().
Remove duplicate Given note
Hide issue about focus.
Fix H4 WS
If ending shape has a zero width -> ellipse
Note that the last color-stop -> Note: This means that...


* Investigate removal of image-resolution
* If image-orientation has not been implemented,
  drop to an informative appendix.
* Investigate values of image-rendering that need to be kept
* Use parse-time aliasing for optimizeSpeed/optimizeQuality
* Consider deferring Interpolation to L4
* Verify serialization, do we have tests?
* Collect gradient tests