In the Initial Motion section, you'll notice that the values in the fields have a lower case "x" next to them. If both the horizontal and vertical directions have a value set to 0, the element is essentially pinned to the page and doesn't move. The element with the scroll effect of motion applied (in this case, the tiling image set as the browser fill) moves in the direction(s) that have a value greater than 0 in the field. The values entered in the Final Motion section will be applied after the page is scrolled past the key position (location of the T-handle). (In the Control panel and in the Transform panel, the distance from the top of the page is referenced as the Y value). The top of the page begins at 0 and then the number of pixels increases the further you scroll down a page. The number of pixels specified in the key position field means that the changes you set in the Initial Motion section will move (in that direction, and at that speed) while the page is being scrolled to that location. The default setting of 0px means that the T-handle is set to the very top edge of the browser window. The field in the center section (currently displaying 0px) corresponds to the key position (the T-handle location) that controls the motion.
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