Does it matter in what order attributes are specified within a tag? In other words, is (img src="XXXX.zzz" width="100%" height="100%") treated the same as (img width="100%" src="XXXX.zzz" height="100%"), or even (height="100%" width="100%" img src="XXXX.zzz")??? Thanks.
It may not matter to the machines, but it's a good idea to pick a standard approach and stick with it. It makes it easier to debug code when you always know where to look for things. I alphabetize my CSS rules (border, color, font-size, etc.) for the same reason.
They are treated the same, yes. Therefore attribute order is irrelevant.
While I usually hate one word answers... Yes.