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<!DOCTYPE html>
<head>
<title>Deferred images with loading='lazy' use the original
base URL specified at parse-time</title>
<link rel="author" title="Rob Buis" href="mailto:rbuis@igalia.com">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../resources/common.js"></script>
<base href='/html/semantics/embedded-content/the-img-element/resources/'>
</head>
<script>
const below_viewport_img = new ElementLoadPromise("below-viewport");
let has_window_loaded = false;
async_test(t => {
// At this point, the below-viewport image's request has been set-up, and
// its URL is the URL that was parsed relative to the document's base URL
// at this time. Any changes to the document's base URL from this point
// forward should not impact the image when we scroll it in-view. This is
// because the next step in the #updating-the-img-data algorithm is to to
// fetch the request that has already been set up. Now we'll change the
// document's base URL, and scroll the image in-view.
window.addEventListener("load", t.step_func(() => {
const base = document.querySelector('base');
base.href = '/invalid-url-where-no-subresources-exist/';
has_window_loaded = true;
below_viewport_img.element().scrollIntoView();
}));
below_viewport_img.promise.then(t.step_func_done(() => {
assert_true(has_window_loaded,
"Below-viewport loading=lazy images do not block the " +
"window load event");
}));
below_viewport_img.promise.catch(
t.unreached_func("The image request should not load relative to the " +
"current (incorrect) base URL.")
);
}, "When a loading=lazy image is loaded, it loads relative to the " +
"document's base URL computed at parse-time.");
</script>
<body>
<div style="height:1000vh"></div>
<img id="below-viewport" src="image.png?base-url" loading="lazy"
onload="below_viewport_img.resolve()"
onerror="below_viewport_img.reject()">
</body>
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