<h4># left</h4>
<div id="a">a</div><!-- 1番左に寄せられる -->
<div id="b">b</div><!-- 2番目に左に寄せられる -->
<div id="c">c</div><!-- 3番目に左に寄せられる -->
div{
  width:100px;
  height:100px;
  border:solid 1px;
 }
#a{
  background-color:lime;
  float:left;
}
#b{
  background-color:skyblue;
  float:left;
}
#c{
  background-color:yellow;
  float:left;
}

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