为何空间已经满了，元素还会插入？_html/css_WEB-ITnose

body {
font-size:19px;
}
#box {
width:500px;
float:left;
}
#box-1 {
width:100px;
height:100px;
background-color:#FF0;
margin:10px;
float:left;
}
#box-2 {
width:100px;
height:100px;
background-color:#FF0;
margin:10px;
float:left;
}
#box-3 {
width:100px;
height:100px;
background-color:#FF0;
margin:10px;
float:left;
}
#box-4 {
width:460px;
height:50px;
background-color:#39F;
margin:10px;
}

id="box-1"

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