<!DOCTYPE html>
<style>
div {
    font: 20px/1 Ahem;
    width: 1em;
    color: green;
}

</style>
webkit.org/b/25638: This test passes if there is a green rectangle below. It tests that we don't
break on an empty inline span in the middle of a word.<br>
<div>wo<span></span>rd</div>
This test passes if there is a green square below. It tests that we 
break on the space after an empty inline span.<br>
<div>wo<span></span> rd</div>