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<!DOCTYPE html>
<head>
<title>Deferred iframes with loading='lazy' changed to eager later
use the document's base URL computed at parse-time</title>
<link rel="author" title="Oliver Medhurst" href="mailto:omedhurst@mozilla.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-iframe-element/resources/'>
</head>
<script>
const below_viewport_iframe = new ElementLoadPromise("below-viewport");
let has_window_loaded = false;
async_test(t => {
// Change the base URL and scroll down to load the deferred iframe.
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_iframe.element().loading = 'eager';
}));
below_viewport_iframe.promise.then(
t.step_func_done(() => {
assert_true(has_window_loaded,
"Below-viewport loading=lazy iframes do not block the " +
"window load event");
assert_true(below_viewport_iframe.element().contentDocument.body.
innerHTML.includes("<p>Subframe</p>"),
"The loading=lazy iframe's content is accessible upon loading");
}));
}, "When a loading=lazy iframe is changed to eager later before loading, it loads relative to the " +
"document's base URL computed at parse-time.");
</script>
<body>
<div style="height:1000vh"></div>
<iframe id="below-viewport" src="subframe.html" loading="lazy"
width="200px" height="100px" onload="below_viewport_iframe.resolve()">
</iframe>
</body>
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