background-image-column-collapsed-ref.html

<!doctype html>
<style>
  body {
    --peek: LightGreen;
  }
  .bg {
    background-color: var(--peek);
    background-image: linear-gradient(90deg, orange 0px, orange 10px, gainsboro 3px, gainsboro 25%, rgba(160,160,160,0.5) 25%, rgba(160,160,160,0.5) 50%, silver 50%, silver 75%, darkgray 75%, darkgray 170px, blue 170px);
    background-repeat: no-repeat;
    background-size: 50px 200px;
  }
  main * {
    box-sizing: border-box;
  }
  .td {
    width: 50px;
    height: 50px;
    position:absolute;
  }
</style>

<main>
<div style="position: relative;border: 10px solid transparent; width:210px; height: 210px">
  <div class="td bg" style="top:-5px;left:-5px;height:200px"></div>
  <div class="td bg" style="top:-5px;left:45px;height:200px"></div>
  <div class="td" style="background:var(--peek); height:100px; left:95px;top:45px"></div>
  <div class="td bg" style="top:-5px;left:145px;height:200px;width:100px;background-size: 100px 200px"></div>
</div>

</main>

chromium/third_party/blink/web_tests/external/wpt/css/css-tables/tentative/paint/background-image-column-collapsed-ref.html