Preview the SVG Path feature, get visual help.
The editor was sensitive to the commands typed, you should type in the following format:
[Function] [Commands] [Commands]
[Function] [Commands]
...
Example:
M 5 5
h 5
v 5
h -5
z
Wrong:
M5 5
h 5 v 5 h -5 z
Visual aid for some commands is not good enough: a, t, s (Arch, smooth curve).
Inspiration: nan.fyi/svg-paths