Explain CSS3 in detail filter:drop-shadow Difference and application of filter and box shadow | Develop Paper
html - Artifacts on CSS rendering box-shadow on Safari 6.0.2 on mountain lion - Stack Overflow
Marco Rinck on Twitter: "When #Safari opens so much (empty, non-working) #webconsole windows that you get a really nice and thick box shadow because the shadows of each window add up. #bug