Dreamweaver - line through css

When I'm working in dreamweaver, in the css panel there are often lines through the different css. I don't understand what that means. Does it mean it's not needed or used incorrectly, or just telling you somethine else.

Thanks...
designaireAsked:
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Joshua_PetersConnect With a Mentor Commented:
Properties irrelevant to a selection are displayed with a red strike-through line
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designaireAuthor Commented:
What do you mean irrelevant? Does it mean you don't need them?
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Joshua_PetersConnect With a Mentor Commented:
Yes but I guess it sounds kind of rude. It just doesn't apply to that item you are working on. If you take them out the style won't change.
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designaireAuthor Commented:
You mean the style they are applied to won't change but maybe something else will. I have a style that has a border, inside I have a table. When I put my cursor on the table the lines go throught he border styles. If I take out the border style the table isn't effected but the border around the outside of the page goes away.  Does that sound correct?
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Joshua_PetersCommented:
Yes it does. So it just means it doesn't apply to that section.
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