how to check what css code is invalid using browser plugins [closed]

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I was looking around different browsers plugins to find out what kind of developer tool I can use to verify what invalid css code or line I have in my html pages or css files. I want to know if common browsers such as Chrome or FF have the ability with some plugin to test or check valid and invalid css property. I know that Chrome has inspection element tool by default through the mouse by right-click and selecting the last option. However, it doesn't seem that this tool can show what code is incorrect or what exactly invalid...

any idea about that?

Thanks

Answer 1

Have you tried Web Developer Tools? that's a chrome extension.