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William Keely7,295 Points
Why is the positioning context the viewport? Is it absolute referencing always in relation tot he viewport? This seems to glossed over.
Steven Parker228,001 Points
The viewport is the default positioning context.
You can create another positioning context just by setting a parent or ancestor element's position to "relative". Then the offsets of the absolutely positioned element will be based on the other element and not the viewport.
Here's a Treehouse blog post with some addition explanation and illustrations.