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<!DOCTYPE html>
<head>
<title>Deferred loading=lazy images load relative to the document's base URL
at parse-time</title>
<link rel="author" title="Dom Farolino" href="mailto:dom@chromium.org">
<link rel="author" title="Raj T" href="mailto:rajendrant@chromium.org">
<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");
let has_window_loaded = false;
async_test(t => {
// Change the document's base URL to a bogus one, and scroll the
// below-viewport img into view. When it loads, it should load relative
// to the old base URL computed at parse-time.
window.addEventListener("load", t.step_func(() => {
window.history.pushState(2, document.title,
'/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>
<script>
// Change the document's base URL so that the img request parses relative
// to it when it sets up the request at parse-time.
window.history.pushState(1, document.title, 'resources/')
</script>
<img id="below-viewport" src="image.png" loading="lazy"
onload="below_viewport_img.resolve()"
onerror="below_viewport_img.reject()">
</body>
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