Switch to the Style side panel ⇒ There should be three entries with the selector #element containing a background-image property
Inspect the green <div> (#frameElement) ⇒ There should be three entries with the selector #frameElement containing a background-image property
Expected result
If a CSS file is included several times, the style definition must be shown
several times inside the Style side panel and there must be a way
to distinguish them.