l word boundaries at reasonable points, which can then be expanded into spaces">
<style>
div {
  font-size: 2em;
  border: solid black;
  margin: 5px;
  width: 30ch;
}
#test {
  word-boundary-detection: auto(th);
  word-boundary-expansion: space;
}
#ref {
  border-color: blue;
}
</style>
<!--

This test should pass even in UAs that don't support word-boundary-detection:auto(th)
since inserting virtual word boundaries is the default for south-east-asian languages.
-->

<p>Test passes if the black box is iden