Table related elements share style properties with their enclosing table and those properties and values are not shown in the Inspector Style pane. This means the Web Inspector will not always show all the properties that end up in the computer style, causing a mismatch. This information is available from additionalAttributeStyleDecls on the elements. It is not clear what the best way to show this information is.
<rdar://problem/5712918>
This is now called additionalAttributeStyle(). And it can be shown with the other attribute styles now that we group them in one section.
It's now called additionalPresentationAttributeStyle(), it seems to only concern some border properties that leak from the table group. I would need a test case to be sure if this is still an issue.