space processing, so inserted spaces can be preserved by white-space:pre">
<style>
div {
  font-size: 2em;
  white-space: pre;
}
#test {
  word-boundary-expansion: space;
}
</style>

<p>Test passes if the two lines below are identical.

<div id=test>a<wbr> b <wbr>c &#x200B;d&#x200B; e<wbr><wbr>f&#x200B;&#x200B;g<wbr>&#x200B;h&#x200B;<wbr>i <wbr> &#x200B; j</div>
<div id=ref>a  b  c  d  e  f  g  h  i     j</div>
