Where is this mysterious negative position originating from in Firebug?

I'm dealing with an element that has the following CSS attributes:

.myElem {
  position: absolute;
  width: 100%;
  top: 25px;
  height: 6px;
  padding: 1px 0px;
}

Can someone please take a look at this screenshot I uploaded? When checking the layout tab in Firebug, I noticed a '-13' at the bottom. Where did it come from? What does it signify? I never specified it so why is it being displayed there? Does it have any significance for 'bottom' or does it represent something else?

Answer №1

Display position is determined from the bottom, but will be negative if it overlaps with or exceeds its parent's top position.

Take a look at this example http://jsfiddle.net/wqrh6/

In the provided scenario, when the top position of .myElem overlaps with its parent, Firebug displays the position from the bottom.

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