image-loading-lazy-referrerpolicy-change.sub.html

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This WPT test may be referenced by the following Test IDs:
- /html/semantics/embedded-content/the-img-element/image-loading-lazy-referrerpolicy-change.sub.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<head>

  <title>Deferred loading=lazy images are fetched with the latest

         `referrerpolicy` attribute</title>

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

  <link rel="author" title="Raj T" href="mailto:rajendrant@chromium.org">

  <link rel="help" href="https://html.spec.whatwg.org/multipage/images.html#updating-the-image-data">

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

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

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

</head>

<script>

  const below_viewport_img = new ElementLoadPromise("below_viewport_img");

  async_test(function(t) {

    // At this point the image's #updating-the-image-data algorithm has been

    // invoked, and the image request has been deferred. The deferred request

    // was created with the default referrer policy, which will result in a

    // `Referer` header being sent when the request is finally made. The request

    // is also for an image that the server will send a broken response for if

    // the request has a `Referer` header.

    // While the request is deferred, we'll set the `referrerpolicy` attribute

    // to `no-referrer`, which would cause the image request to succeed. Since

    // `referrerpolicy` mutations trigger another #updating-the-image-data

    // invocation (replacing the first one), when we scroll the image into view,

    // the image should be fetched with no `Referer` header, and succeed.

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

      below_viewport_img.element().referrerPolicy = "no-referrer";

      below_viewport_img.element().scrollIntoView();

    }));

    below_viewport_img.promise

      .then(t.step_func_done())

      .catch(t.unreached_func("The image request should successfully load"))

  }, "Test that when a deferred image is loaded, it uses the latest referrerpolicy");

</script>

<body>

  <div style="height:1000vh;"></div>

  <img id="below_viewport_img"

       src="resources/referrer-checker-img.py?expected_referrer="

       loading="lazy" referrerpolicy="unsafe-url"

       onload="below_viewport_img.resolve();"

       onerror="below_viewport_img.reject();">

</body>