Water line to toilet, can I T from sink?

[socaldano]

I saw someone T from the cold water on the sink to the toilet.
I like that idea, is there any thoughts on it being ok, to T after the shutoff under the vanity, to run a line to the toilet?
I want to know both the thoughts and the code....
or do I need to continue to use the line specific to the toilet?

I currently redoing a screwed up bathroom remodel. One of the problems is that the shutoff for the toilet is half recessed into the wall. I would rather cap it, put an aluminum cover over it, and run water from the vanity. Otherwise, we shut off water, open wall up, sweat on about 3" extension and put the shutoff back on...

I just prefer the cleaner look of the shutoffs under the vanity...

Thanks