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<!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>
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