Coordinate origin: top-left or bottom-left?

[cmavelis]

Just wondering what other peoples' experience were with using x-y coordinates in a web game. I'm making a game with a board, and it feels intuitive (and is my experience) to have the coordinate origin (0,0) in the bottom left, so the whole grid is in positive coordinates. However, a browser flows top-down, so the coordinates start at the top left, and y is positive going down.

I'm concerned that if I don't match my game coordinates to those of the browser, I'll confuse myself once I start drawing and animating things between squares. But I've spent a much longer time thinking with +y going up.

FreeBoardGames.org checkers uses +y going down, which does seem like the simpler path.

Any thoughts?