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chromium/third_party/blink/renderer/core/testing/data/icb-relative-content.html 

<!DOCTYPE html>
<style>
  body {
    width: 1600px;
    height: 1200px;
  }
  div {
    bottom: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background-color: gray;
    position: absolute;
  }
</style>
<div></div>