<!DOCTYPE html> <!-- webkit-test-runner [ LayoutFormattingContextEnabled=true LayoutFormattingContextIntegrationEnabled=false ] -->
<style>
.container {
  background-color: green;
  color: green;
  font-size: 40px;
  font-family: Ahem;
}

span {
  vertical-align: middle;
}
</style>

<div class=container>
  XX
  <span>
    XX
  </span>
</div>