LayoutTests/fast/inline/margin-with-float-and-block-in-inline.html

<style>
body {
  font-family: Ahem;
  font-size: 10px;
}

.float {
  float:left;
  width: 10px;
  height: 30px;
  background-color: green;
}

.block_box {
  margin-top: 50px;
  background-color: transparent;
  width: 10px;
  height: 10px;
}
</style>
<div>
  <div class=float></div>
  <span>
    <div class=block_box></div>
  </span>
  after
</div>

<div style="padding: 1px"></div>

<div>
  <div class=float style="clear: both"></div>
  <span>
    <div class=block_box></div>
  </span>
  after
</div>