pageY

Gets the distance in pixels between the pointer and the top edge of the page.

The page refers to the entire web page, even parts that are not currently viewable in the browser. Therefore, two clicks on the same physical point of the screen return different pageY values if the page is scrolled vertically in the meantime. But two clicks on the same point on the page return the same pageY values even if the page is scrolled vertically in the meantime.