While editing a CSS property, value or selector it should be indicated whether the currently entered value is valid and applies to the selected element. Firebug 2 does this by showing a red, yellow or green glow effect arround the inline editor. A description of what those colors mean can be found here: https://getfirebug.com/wiki/index.php/CSS_Panel#Editing_rules Sebastian
This is a nice idea. Not going to be a priority in the coming months for the team though. Patches welcome though :)
Priority: -- → P3
Component: Developer Tools: Inspector → Developer Tools: CSS Rules Inspector
Summary: [rule view] Show whether a CSS property, value or selector is valid → Show whether a CSS property, value or selector is valid
Bug 1411664 addresses part of this issue. It updates the warning next to the declaration to indicate if the property name is invalid.
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