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Matthew Lang13,483 Points
I'm not too sure what you're asking exactly, however hopefully this can clear up some confusion.
An element with absolute positioning will be positioned relative to any parent/grandparent that has a relative positioning. I believe by default the 'html' tag has relative positioning by default however I am not sure...
So if you have a div, and it had relative positioning, then an image inside the div with absolute positioning, the image would be positioned relative to the div container. If the div container did not have relative positioning, the image would be positioned relative to the next parent/grandparent that has relative positioning.
Apologies, but that probably isn't explained too well. Here's a JSFiddle: https://jsfiddle.net/sL12cten/