Specifying a preferred line break point in HTML text in a responsive design [duplicate]

I think this works very well:

span.line {
  display: inline-block;
}

<p>
  <span class="line">This text should break</span>
  <span class="line">after the word "break"</span>
</p>

The text still breaks on other places when there is not enough space:

open demo