File: iframe-loading-lazy-in-scroller-nested-3.html

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<!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;
  }

  #scroller3 {
    width: 120px;
    height: 120px;
    overflow: scroll;
  }

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

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

<div id=scroller3>
  <div id=scroller2>
    <div id="scroller">
      <div id="spacer"></div>
      <iframe
        id="target"
        src="resources/subframe.html"
        loading="lazy"
        onload="iframe_onload();"
      ></iframe>
    </div>
  </div>
</div>

<script>
  const t = async_test(
    "Test that lazy-loaded iframes load when near viewport."
  );

  function iframe_onload() {
    t.done();
  }

  t.step_timeout(() => {
    t.unreached_func(
      "Timed out while waiting for iframe to load."
    )();
  }, 2000);
</script>