Find projection of point on plane using W|A?

[chunkmeal3 (Joe Doe)]

For example, the projection of the point P=(1,2,3) on the plane x+y+z=3 is the point Q=(0,1,2).

How do I ask Wolfram Alpha to compute this? I’ve tried “projection of point (1,2,3) on plane x+y+z=3”, but this doesn’t work.