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chromium/third_party/blink/web_tests/external/wpt/css/css-page/page-background-003-print-ref.html 

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:[email protected]">
<style>
  @page {
    size: 500px 250px;
    margin: 0;
  }
  body {
    margin-left: 100px;
  }
</style>
<div style="position:absolute; z-index:-1; top:0; left:0; overflow:clip; contain:size; width:100px; height:500px;">
  <img src="support/cat.png" style="display:block;">
  <img src="support/cat.png" style="display:block;">
  <img src="support/cat.png" style="display:block;">
  <img src="support/cat.png" style="display:block;">
  <img src="support/cat.png" style="display:block;">
  <img src="support/cat.png" style="display:block;">
</div>
There should be two and a half cats on this page.
<div style="break-before:page;">
  There should be two and a half cats on this page, too (and the ears of another
  cat barely visible at the bottom). The previous page ends with a cat's head,
  and this page starts with a cat's body.
</div>