wpt/css/css-multicol/fixedpos-static-pos-with-viewport-cb-001.html at master · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<title>
  Nested fixedpos static position in a multicol with viewport containing block.
</title>
<link rel="help" href="https://www.w3.org/TR/css-position-3/#abspos-breaking">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<style>
  .multicol {
    column-count: 2;
    column-fill: auto;
    column-gap: 0px;
    width: 50px;
    height: 100px;
    margin-top: -100px;
    margin-left: -175px;
  }
  .rel {
    position: relative;
  }
  .abs {
    position: absolute;
    width: 25px;
    height: 400px;
  }
  .fixed {
    position: fixed;
    width: 100px;
    height: 100px;
  }
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div class="multicol">
  <div class="rel">
    <div style="height: 400px;"></div>
    <div class="abs">
      <div style="height: 400px;"></div>
      <div class="fixed" style="background: green;"></div>
    </div>
  </div>
</div>
<div class="fixed" style="background: red; z-index: -1;"></div>