浮动一个或两个内部div。
#wrapper {
width: 500px;
border: 1px solid black;
overflow: hidden; /* will contain if #first is longer than #second */
}
#first {
width: 300px;
float:left; /* add this */
border: 1px solid red;
}
#second {
border: 1px solid green;
overflow: hidden; /* if you don't want #second to wrap below #first */
}
@H_404_6@或者如果您同时浮动两个子元素，则需要鼓励包装器div包含两个浮动子元素，否则它会认为它是空的而不是在它们周围放置边框
#wrapper {
width: 500px;
border: 1px solid black;
overflow: hidden; /* add this to contain floated children */
}
#first {
width: 300px;
float:left; /* add this */
border: 1px solid red;
}
#second {
border: 1px solid green;
float: left; /* add this */
}
@H_404_6@
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