Issue 2440: Disappearing Styles When Edited

Steps to reproduce

  1. Open Firebug
  2. Switch to the HTML panel
  3. Inspect the blue <div> (#element)
  4. Switch to the Style side panel
    ⇒ There should be three entries with the selector #element containing a background-image property
  5. Inspect the green <div> (#frameElement)
    ⇒ There should be three entries with the selector #frameElement containing a background-image property

Expected result