I've been using Chrome for a long time now and I've never (well not that I can recall) come across CSS definitions in the Style panel that are faded. The selector hasn't been defined else where.

Example:

enter image description here

(Edit: Just to be clear, I'm not referring to the user agent stylesheet)

I can't figure out why it is faded and what this means. The definition appears to be editable but any changes to the values do not persist (i.e. as soon as I click off, it reverts back to original value) and has no effect on the web page.

I couldn't find any reference to this in the documentation for the tool. Can any of you kind folk shed any light on this?

css google-chrome styles
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