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div悬浮

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title></title><style type="text/css"></style></head><body><!--z-index 属性设置元素的堆叠顺序。拥有更高堆叠顺序的元素总是会处于堆叠顺序较低的元素的前面。z-index 仅能在定位元素上奏效(例如 position:absolute;)!--><div style=‘position:relative; width:500px; height:500px;‘><div style=‘position:absolute; z-index:2; width:300px; height:300px; left:0px; top:0px; background-color:red;‘></div><div style=‘position:absolute; z-index:3; width:200px; height:200px; left:0px; top:0px;background-color:green;‘‘></div></div></body></html> 

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div悬浮