How to position absolutely inside float:left?

Question

Why adding of left rule changes behavior so drastically? Is it possible to position relative to default position?

http://jsfiddle.net/suzancioc/drDn3/6/

HTML:

    <div class='level0'>
   <div class='level1'>
       Hello

   </div>
   <div class='level1'>
       Hello
       <div id='inner2'>inner2</div>
   </div>
       <div class='level1'>
       Hello
       <div id='inner3'>inner3</div>
   </div>

</div>

CSS:

.level0 {
   height:40px;
   width: 500px;
   background:red;
}
.level1 {
   float:left;
   margin:2px;
   border-style: solid;
   background: cyan;

}
#inner1 {
   position: absolute;
   background: green;
}

#inner2 {
   position: absolute;
   background: green;
    left:0px;
}

#inner3 {
   position: absolute;
   background: green;
}

Answer 1

In order to position absolute something you need to assign that div(in your case) to a relative positioned parent

.level1 {
   float:left;
   margin:2px;
   border-style: solid;
   background: cyan;
   position:relative;

}

Adding position:relative makes .level1 a sort of coordinate system for all elements inside of it.

Take a look at this JSFIDDLE