SnipCSS extracts every CSS rule needed to rebuild the DOM subtree of an element. Unlike other tools it never uses computed styles.
Rather than cherry-picking the styles you want from a widget, you can now copy the whole widget in one try. Save time and learn what styles matter by copying the DOM subtree and all styles being used in that subtree.
The SnipCSS Chrome extension is free. You can try it out to see the basic features of SnipCSS before trying the full version.