<style>
.container {
  width: 0px;
  font-family: Ahem;
}
.inline_block {
  display: inline-block;
  width: 100px;
  height: 100px;
  float: right;
}
</style>
<!-- PASS if content _after_ the float is visible -->
<div class=container>XX<div class=inline_block></div>XX</div>