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chromium/third_party/blink/web_tests/external/wpt/css/css-grid/grid-fragmentation-between-rows-001-print-ref.tentative.html 

<!DOCTYPE html>
<div style="height:40vh">
  Test passes if there is two purple boxes on both page 1 and page 2 in print mode. (Ctrl+P, with "print backgrounds" enabled)
</div>
<div style="display:grid; grid-template-columns:1fr 1fr;">
  <div style="contain:size; height:40vh;">
    <div style="height:40vh; width: 20vw; background:purple;"></div>
  </div>
  <div style="contain:size; height:40vh;">
    <div style="height:40vh; width: 20vw; background:purple;"></div>
  </div>
</div>
<div style="display:grid; grid-template-columns:1fr 1fr; break-before:page;">
  <div style="contain:size; height:40vh;">
    <div style="height:40vh; width: 20vw; background:purple;"></div>
  </div>
  <div style="contain:size; height:40vh;">
    <div style="height:40vh; width: 20vw; background:purple;"></div>
  </div>
</div>