LayoutTests/fast/text/wbr-simple.html

<style>
div {
  width: 0px;
  font-family: Ahem;
  font-size: 20px;
}
</style>
<div>this<wbr>is<wbr>a<wbr>simple<wbr>test<wbr>for<wbr>word<wbr>break<wbr>opportunity</div>