There should be a link to MDN when a CSS property's computed value differs from the authored value. The MDN page(s) are expected to explain in detail the reasons why the authored value was overwritten / is useless. This is part of the discussion between the MDN and the DevTools team regarding an improved integration of both: Sebastian  https://docs.google.com/document/d/1TteutcGV5WGnDeCliJAunRWNVG7t1yAF-HIuuzYpqyw/edit
Summary: Link to MDN for CSS properties having computed value differening from authored value → Link to MDN for CSS properties having computed value differing from authored value
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