rd boundary when the language is unknown">
<style>
div {
  font-size: 2em;
  border: solid black;
  margin: 5px;
  width: 30ch;
}
#test {
  word-space-transform: ideographic-space auto-phrase;
}
</style>

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

<div id=test>東京へ行きましょう。</div>
<div id=ref>東京へ行きましょう。</div>
