<!DOCTYPE html>
<head>
  <title>Iframes with loading='eager' load immediately regardless of their
         position with respect to the viewport.</title>
  <link rel="author" title="Scott Little" href="mailto:sclittle@chromium.org">
  <link rel="help" href="https://github.com/scott-little/lazyload">
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
</head>

<script>
  const t = async_test("Test that iframes with loading='eager' load " +
                       "immediately regardless of their position with " +
                       "respect to the viewport.");

  let has_in_viewport_loaded = false;
  const in_viewport_iframe_onload = t.step_func(() => {
    assert_false(has_in_viewport_loaded,
                 "The in_viewport element should load only once.");
    has_in_viewport_loaded = true;
  });

  let has_below_viewport_loaded = false;
  const below_viewport_iframe_onload = t.step_func(() => {
    assert_false(has_below_viewport_loaded,
                 "The below_viewport element should load only once.");
    has_below_viewport_loaded = true;
  });

  window.addEventListener("load", t.step_func_done(() => {
    assert_true(has_in_viewport_loaded,
                "The in_viewport element should have loaded before " +
                "window.load().");
    assert_true(has_below_viewport_loaded,
                "The below_viewport element should have loaded before " +
                "window.load().");
  }));
</script>

<body>
  <iframe id="in_viewport" src="resources/subframe.html?in-viewport"
          loading="eager" width="200px" height="100px"
          onload="in_viewport_iframe_onload();"></iframe>
  <div style="height:1000vh;"></div>

  <!-- The below_viewport element loads very slowly in order to ensure that the
       window load event is blocked on it. -->
  <iframe id="below_viewport"
          src="resources/subframe.html?below-viewport&pipe=trickle(d1)"
          loading="eager" width="200px" height="100px"
          onload="below_viewport_iframe_onload();"></iframe>
</body>
