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chromium/third_party/blink/web_tests/external/wpt/css/css-position/position-fixed-overflow-print.html 

<!doctype html>
<title>position: fixed doesn't overflow the margin area</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:[email protected]">
<link rel="author" title="Mozilla" href="https://mozilla.org">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1714513">
<link rel="help" href="https://drafts.csswg.org/css-position/#abspos-insets">
<link rel="match" href="position-fixed-overflow-print-ref.html">
<style>
  body { margin: 0 }

  #outer, #inner {
    background-color: purple;
    width: 100vw;
    height: 100vh;
  }

  #inner {
    position: fixed;
    background-color: blue;
    top: 0;
    left: 50%;
  }
</style>
<div id="outer">
  <div id="inner"></div>
</div>