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<!doctype html>
<html lang=en>
  <meta charset=utf-8>
  <title>CSS-contain test reference</title>
<style>
article {
  columns: 2 1ch;
  column-gap: 0;
  float: left;
  font-family: monospace;
  margin-right: 3em;
  line-height: 1;
  height: 4em;
  column-fill: auto;
}
div:last-of-type {
  break-before: column;
}
</style>
<p>Test passes if there are two identical blocks “A” letters below.
<article>
  <div>A<br>A</div>
  <div>A<br>A</div>
</article>
<article>
  <div>A<br>A</div>
  <div>A<br>A</div>
</article>