<!DOCTYPE html>
<link rel="help" href="https://html.spec.whatwg.org/#lazy-load-root-margin">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<style>
  #scroller {
    width: 100px;
    height: 100px;
    overflow: scroll;
    background-color: gray;
  }

  #scroller2 {
    width: 110px;
    height: 110px;
    overflow: scroll;
  }

  .spacer {
    width: 130px;
    height: 130px;
  }

  #target {
    width: 100px;
    height: 100px;
  }
</style>

<d