Chrome dev tools display a CSS rule on a gray background. What for?

Just to be clear - I'm not saying that the property was "gray-haired" or broken; This is a CSS rule that displays fine, but with a gray background . Other applicable rules are displayed normally, without a gray background. Does anyone know what a gray background means?

The reason I ask, even though the properties were not grayed out or punched through , the rule does not seem to apply. I hope that the gray background will be significant, and this value may explain why the rule does not apply.

Edit
I was told that I should edit the question to make it clear why this is not a duplicate of the question above. I can only repeat that I am not asking about greyed-out properties; I am asking about a CSS rule displayed on a gray background . This was what I indicated in the original question above. If you look at the accepted answer to this question, you will see that the user asks a question about CSS properties with gray color (why otherwise he will accept this answer?)
Any chance that someone can remove the duplicate link?

CSS rules, some on a gray background

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According to the old Chrome developer site :

DOM node , node. , .

Chrome Dev Tools, , /, :

Live-edit "". , , ( ).

, greyed out , , .

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Source: https://habr.com/ru/post/1684306/


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