noob: css left right px movement

[johnCash]

when you say left:-450px, where does the (0,0) coordinate start from, top right hand corner of the brower?
left-450px moves right 450 px?
if left: 450px, then it moves left 450px from right position?

[markbrown4]

left is relative to the left edge of the element.
right is relative to the right edge of the element etc..

So if you set everything to 0 it should stretch the element to the full height/width of the parent, though IE doesn't do this.

left-450px moves right 450 px?

No it doesn't
left: -450px; would move the left edge of the element 450px left.

[Dan Schulz]

Not only that, but the coordinates 0, 0 refer to "top left" as well. Think of a clock, or a box. You start at 12:00 then move to 3:00 then 6:00 then 9:00 and back to 12. With a box, you normally start in the upper left hand corner, draw a line to the right, then go down, stop and draw a line to the left, and then go back up again to close it.

Same thing here.