LayoutTests/fast/inline/blocks-in-inline-with-legacy-line-clamp.html

<!-- webkit-test-runner [ BlocksInInlineLayoutEnabled=true ] -->
<style>
.clamp {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  overflow: hidden;
}
</style>
<div class=clamp>
  <span>
    first line
    <div>
      second line<br>
      third line
    </div>
  last line
  </span>
</div>