Should zero-width viewBox be valid?

[Hixie]

Right now the spec says that a file with minX == maxX is valid. Is that intentional?

[Hixie]

(and obviously, same with the Y dimensions)

[nigeltao]

Yes, that's intentional. I think a zero-width viewBox is a valid graphic in the same way that an empty string is a valid string. It'd be an empty graphic, because the viewBox is a clip (issue #15).

Implementations might therefore have to be concious of potential divison-by-zeroes at various places, but I think that's a reasonable requirement. That might be worth explicitly calling out in the spec...

Let me know if there's any specific implementation issues you have in mind re zero width/height viewBoxes.

[Hixie]

I don't see any purpose in supporting it, but whether it's considered an error or an empty graphic seems moot, so this is fine by me.