光の三原色：RGB； 色の三原色：CMY(K)
red(#FF0000) + cyan(#00FFFF) = white(#FFFFFF)
green(#00FF00) + magenta(#FF00FF) = white(#FFFFFF)
blue(#0000FF) + yellow(#FFFF00) = white(#FFFFFF)
cyan(#00FFFF) = green(#00FF00) + blue(#0000FF)
magenta(#FF00FF) = red(#FF0000) + blue(#0000FF)
yellow(#FFFF00) = red(#FF0000) + green(#00FF00)
<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="utf-8">
<head>
背景色テスト
</head>
<body bgcolor=springgreen>
背景色テスト
</body>
</html>
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