iframe-loading-eager.html

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This WPT test may be referenced by the following Test IDs:
- /html/semantics/embedded-content/the-iframe-element/iframe-loading-eager.html - WPT Dashboard Interop Dashboard

<!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>