Inset box shadows with spread and rounded corners also spread to the outside if an outset box shadow is present · Issue #1737 · servo/webrender · GitHub
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Box-shadow, one of CSS3's best new features - CSS3 . Info
Box shadow , rounded corner shadow , circle shadow
How Do Browsers Render the Different CSS Border Style Values? - Impressive Webs
CSS3 Box Shadow, only top/right/bottom/left and all · GitHub
Box shadow , rounded corner shadow , circle shadow