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box-shadow: shadow offset value (can take positive and negative values); shadow vertical offset value (can take positive and negative values); shadow blur value; shadow color
FireFox support Box Shadow: -moz-box-shadow:2px 2px 5px #333;
Safari and Chrome with webkit kernel support Box Shadow: -webkit-box-shadow:2px 2px 5px #333;
Opera supports Box Shadow: box-shadow:2px 2px 5px #333;
IE does not support Box Shadow;
Knowledge expansion:
Gecko (used by FireFox browser)
webkit (developed by Safari Apple, used by Chrome)
Trident (used by IE browser)
Opera browser developed by a Norwegian company OPEN Browser
Netscape Netscape Browser