path.isValid()
Return true
if the path has valid path data (and thus may be used as a d
attribute of an SVG DOM element).
Return true
if the path has no segments. Return false
if the path has segments but does not start with a Moveto.
You may use the path.validate()
function to add an initial 'M 0 0'
segment to invalid paths; the method leaves valid paths unchanged.