

Discover more from Can I DevTools?
Get weekly tips & tricks for your favorite browser devtools, created by @pankajparashar.
Continue reading
Chrome, Edge, Opera
Enable authoring hints, by opening Settings (
F1
) > Experiments > Filter on "authoring hints" > Check "Enable CSS Authoring hints..."
In Elements > Locate the authored styles in the Styles pane > Inactive declarations have an "i" icon, which on hover reveals a tooltip displaying more information.
Firefox
In Inspector > Locate the styles in the Rules pane. Inactive styles will have an "i" icon next to it, which on hover will reveal more information about it.