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chromium/third_party/blink/web_tests/fast/ruby/break-within-bases-text-wrap.html 

<!DOCTYPE html>
<meta charset="utf-8">
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<title>Don't break rubies in a container with `text-wrap:balance` or `text-wrap:pretty`</title>
<style>
.balance {
  text-wrap: balance;
}
.pretty {
  text-wrap: pretty;
}

p {
  inline-size: 5em;
}
</style>

<p class="balance"><ruby>二等辺三角形<rt>にとうへんさんかくけい</ruby></p>
<p class="pretty"><ruby>二等辺三角形<rt>にとうへんさんかくけい</ruby></p>

<script>
test(() => {
  assert_equals(document.querySelector('.balance ruby').getClientRects().length, 1);
}, `text-wrap: balance`);

test(() => {
  assert_equals(document.querySelector('.pretty ruby').getClientRects().length, 1);
}, `text-wrap: pretty`);
</script>