LayoutTests/fast/text/line-clamp-truncation-assert.html

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<style>
div {
  width: 47px;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 1;
  font-size: 12px;
  word-wrap: break-word;
  font-family: Helvetica, Hiragino Sans;
  overflow: hidden;
}
</style><div>ーアね✍️</div>