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                        /初识HTML(5)+CSS(3)-升级版

one 中的margin-left 是对哪个点设置的呀 border设置的100px是对三角形的底边边长吗

#one
{
width: 0px;
height: 0px;
border-top: 100px solid transparent;
border-right: 100px solid transparent;
border-bottom: 100px solid green;
border-left:100px solid transparent ;
margin-left: 100px;
float: left;
}
#two
{
width: 0px;
height: 0px;
border-top: 200px solid transparent;
border-right: 200px solid transparent;
border-bottom: 200px solid green;
border-left:200px solid transparent ;

}
#three
{
width: 100px;
height: 200px;
background: gray;
margin-left: 150px ;

}