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chromium/third_party/blink/web_tests/external/wpt/css/css-page/margin-boxes/auto-margins-002-print-ref.html 

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:[email protected]">
<style>
  @page {
    margin: 0;
    size: 500px 440px;
  }
  body {
    display: grid;
    grid-template-columns: 100px auto 100px;
    grid-template-rows: 100px auto 100px;
    height: 100vh;
    margin: 0;
  }
  .square {
    box-sizing: border-box;
    width: 100px;
    border: solid;
    flex: 1;
    background: green;
  }
  .vertical-edge {
    display: flex;
    justify-content: space-between;
  }
  .horizontal-edge {
    display: flex;
    flex-flow: column;
    justify-content: space-between;
  }
  .pagearea {
    border: solid;
    padding: 8px;
  }
</style>

<div class="square"></div>
<div class="vertical-edge">
  <div class="square"></div>
  <div class="square"></div>
  <div class="square"></div>
</div>
<div class="square"></div>
<div class="horizontal-edge">
  <div class="square"></div>
  <div class="square"></div>
  <div class="square"></div>
</div>
<div class="pagearea">
  There should be 16 margin boxes around this page area. They should take up all
  available space, and there should be no red, only green rectangles with a
  black border.
</div>
<div class="horizontal-edge">
  <div class="square"></div>
  <div class="square"></div>
  <div class="square"></div>
</div>
<div class="square"></div>
<div class="vertical-edge">
  <div class="square"></div>
  <div class="square"></div>
  <div class="square"></div>
</div>
<div class="square"></div>