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chromium/third_party/blink/web_tests/external/wpt/css/css-position/position-absolute-iframe-print-002.sub.html 

<!doctype html>
<title>an abs-pos iframe in the first page but its hypothetical position is in the second page</title>
<link rel="help" href="https://drafts.csswg.org/css-position/#valdef-position-absolute">
<link rel="match" href="position-absolute-iframe-print-ref.html">
<!-- Allow some text antialias pixels to be different. -->
<meta name="fuzzy" content="0-255;0-20">
<style>
  body {
    margin: 0;
  }
  iframe {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
  }
</style>
<div style="height:200vh;"></div>
<iframe frameborder=0 scrolling=no
        src="//{{hosts[alt][www]}}:{{ports[http][0]}}{{location[path]}}/../resources/position-absolute-iframe-child-002.sub.html"></iframe>