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

<!doctype html>
<style>
  body {
    --peek: LightGreen;
  }
  .bg {
    background-color: var(--peek);
    background-image: linear-gradient(45deg, 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 220px, blue 220px);
    background-repeat: no-repeat;
    background-size: 50px 230px;
  }
  main * {
    box-sizing: border-box;
  }
  .td {
    width: 50px;
    height: 50px;
    position:absolute;
    border: 4px solid black;
  }
</style>

<main>
<div style="position: relative;border: 10px solid yellow; width:290px; height: 290px">
  <!-- row 1 -->
  <div class="td bg" style="top:20px;left:20px;height:230px"></div>
  <div class="td bg" style="top:20px;left:80px;"></div>
  <div class="td" style="top:20px; left: 140px;"></div>
  <div class="td" style="top:20px; left: 200px;"></div>
  <!-- row 2
    additional -4 offsets on background-position are for borders.
    columns do not have borders.
  -->
  <div class="td bg" style="top:80px;left:80px;width:110px;height:110px;background-position-y:-64px;background-position-x:-4px"></div>
  <div class="td" style="top:80px; left: 200px;"></div>
  <!-- row 3 -->
  <div class="td" style="top:140px; left: 200px;"></div>
  <!-- row 4 -->
  <div class="td bg" style="top:200px;left:80px;background-position-y:-180px"></div>
  <div class="td" style="top:200px; left: 140px;"></div>
  <div class="td" style="top:200px; left: 200px;"></div>
</div>

</main>