File: text-wrap-balance-top-to-bottom.html

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<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-text-4/#text-wrap">
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#container {
  height: 15ch;
  writing-mode: vertical-rl;
}
.balance {
  text-wrap: balance;
}
</style>
<div id="container"></div>
<script>
const container = document.getElementById('container');
for (const text of [
    '平衡应该',
    '平衡文本换行不应改变行数',
    '平衡文本换行不应改变该文本段落的行数',
  ]) {
  const normal = document.createElement('div');
  const balance = document.createElement('div');
  normal.textContent = text;
  balance.textContent = text;
  balance.classList.add('balance');
  container.appendChild(normal);
  container.appendChild(balance);
  test(() => {
    assert_equals(normal.offsetWidth, balance.offsetWidth);
  });
}
</script>