亚洲国产日韩欧美一区二区三区,精品亚洲国产成人av在线,国产99视频精品免视看7,99国产精品久久久久久久成人热,欧美日韩亚洲国产综合乱

CSS3 RGBA ??

CSS3? RGBA ?? ?? ?? ??? ??:
? ???? RGBA ?? ?? ???? ?????. ?? ??? RGB? ?? ???? ?????. ??? ?? A? ?????.
?? ??:

RGBA(R,G,B,A)

???? ??:
R(red ): ??? ?. ?? ?? |
G(??): ?? ????. ?? ?? |
B(???): ??? ?. ?? ?? |
A(??): ?? ???, 0?? 1 ??? ?.
RGBA? RGB? ???? ?? ???? ???? ??????? ?????. R, G, B ? ?? ????? ?? ?? ?? 0~255??, ??? ?? 0.0%~100.0%???. ?? ?? ?? ?? ??? ? ????, ???? A? ?? 0? 1 ?????. ?? ????? ??? ???? ?? ???? ?? ???? ?? ???? ?? ?????.
???? ???:
RGBA ??? ???? ? ????. IE8 ? IE8 ?? ??????? ???? ???, ?? ?? ??????? ?????.
?? ?:

<!DOCTYPE html>
<html>
<head>
<meta charset=" utf-8">
<meta name="author" content="http://ask.php.cn/" />
<title>CSS3教程</title> 
<style type="text/css"> 
.first{color:rgba(128,128,128,0.2);} 
.second{color:rgba(50%,50%,50%,0.3);} 
.third{color:rgba(160,100,150,0.6);} 
</style> 
</head> 
<body> 
<div class="first">php中文網(wǎng)歡迎您</div> 
<div class="second">php中文網(wǎng)歡迎您</div> 
<div class="third">php中文網(wǎng)歡迎您</div> 
</body> 
</html>
???? ??
||
<!DOCTYPE html> <html> <head> <meta charset=" utf-8"> <meta name="author" content="http://ask.php.cn/" /> <title>CSS3教程</title> <style type="text/css"> .first{color:rgba(128,128,128,0.2);} .second{color:rgba(50%,50%,50%,0.3);} .third{color:rgba(160,100,150,0.6);} </style> </head> <body> <div class="first">php中文網(wǎng)歡迎您</div> <div class="second">php中文網(wǎng)歡迎您</div> <div class="third">php中文網(wǎng)歡迎您</div> </body> </html>