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COLOR
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white
black
red
darkRed
green
darkGreen
blue
darkBlue
cyan
darkCyan
magenta
darkMagenta
yellow
darkYellow
gray
darkGray
lightGray
transparent
color0
color1

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DOC
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http://doc.crossplatform.ru/qt/4.7.x/stylesheet-examples.html
http://doc.crossplatform.ru/qt/4.7.x/stylesheet-reference.html