iframe-loading-lazy-load-event.html

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This test has a WPT meta file that expects 2 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy-load-event.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<head>

  <title>In-viewport loading=lazy iframes do not block the window load event</title>

  <link rel="author" title="Dom Farolino" href="mailto:dom@chromium.org">

  <script src="/resources/testharness.js"></script>

  <script src="/resources/testharnessreport.js"></script>

  <script src="../resources/common.js"></script>

</head>

<body>

  <!-- This image blocks the window load event for 1 second -->

  <img src="/common/square.png?pipe=trickle(d1)">

  <!-- These iframes must load because they intersect the viewport, but they must

       not block the window load event, because they are loading=lazy -->

  <iframe id="visible" loading="lazy"

       src="resources/subframe.html?visible&pipe=trickle(d3)"></iframe>

  <iframe id="visibility_hidden" style="visibility:hidden;" loading="lazy"

       src="resources/subframe.html?visibility_hidden&pipe=trickle(d3)"></iframe>

</body>

<script>

  const visible_iframe = document.querySelector('#visible');

  const hidden_iframe = document.querySelector('#visibility_hidden');

  const visible_iframe_t =

    async_test('In-viewport loading=lazy iframe does not block the load event');

  const hidden_iframe_t =

    async_test('In-viewport loading=lazy visibility:hidden iframe does not ' +

               'block the load event');

  let has_window_loaded = false;

  window.addEventListener("load", () => {

    has_window_loaded = true;

});

  visible_iframe.onload = visible_iframe_t.step_func_done(() => {

    assert_true(has_window_loaded,

                "The visible iframe should not block the load event");

});

  hidden_iframe.onload = hidden_iframe_t.step_func_done(() => {

    assert_true(has_window_loaded,

                "The hidden iframe should not block the load event");

});

</script>