html - Why the `clear:both` can not written into div.box3? -

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i want margin-top:10px displayed on top of box3. here proper codes on firefox.
<div class="clear"></div> written single line before div box3,and write div.clear{clear:both;} special part.

    div.box{          width:105px;          height:200px;          border:1px solid red;          }      div.box1{          float:left;          width:50px;          height:50px;          border:1px solid red;          }      div.box2{          float:left;          width:50px;          height:50px;          border:1px solid red;          }      div.clear{          clear:both;      }        div.box3{          width:100px;          height:80px;          border:1px solid red;  margin-top:10px;          }
<body>      <div class="box">      <div class="box1">box1</div>       <div class="box2">box2</div>       <div class="clear"></div>       <div class="box3">box3</div>      </div>  </body>

now move clear:both; in div.box3,the whole css code below.

    div.box{          width:105px;          height:200px;          border:1px solid red;          }      div.box1{          float:left;          width:50px;          height:50px;          border:1px solid red;          }      div.box2{          float:left;          width:50px;          height:50px;          border:1px solid red;          }      div.box3{      clear:both;          width:100px;          height:80px;          border:1px solid red;          margin-top:10px;          }
<body>      <div class="box">      <div class="box1">box1</div>       <div class="box2">box2</div>       <div class="clear"></div>       <div class="box3">box3</div>      </div>  </body>

no 10px @ top of div.box3.
know right way solve ,want know principle behind proper css code.


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