<!DOCTYPE html>
<style>
div > div {
  border: thin solid black;
  font-family: 'Courier New';
  -webkit-hyphens: auto;
  hyphens: auto;
  width: 5ch;
}
.nowrap {
  white-space: nowrap;
}
</style>
<script>
if (window.internals)
  internals.setMockHyphenation('en-us');
</script>
<div lang="en-us">
  <div>hyphenation</div>
  <div class="nowrap">hyphenation</div>
</div>