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<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title> Composite Color Crash Test </title> <style> .kaboom { margin: 100px; border-width: 20px 20px 20px 20px; -moz-border-top-colors: green red green; border-style: solid; width: 70px; height: 70px; } </style> </head> <body> <div id="box" class="kaboom"></div> </body> </html>