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<!DOCTYPE html>
<head>
<title>Below-viewport iframes with loading='lazy' load when set to
loading='eager' or the `loading` attribute is removed</title>
<link rel="author" title="Dom Farolino" href="mailto:domfarolino@gmail.com">
<link rel="help" href="https://github.com/whatwg/html/pull/5579">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<script>
const t = async_test("Below-viewport iframes with loading='lazy' load when " +
"set to loading='eager' or the `loading` attribute is " +
"removed");
const iframe_1_onload = t.unreached_func("#iframe_1 should not load before " +
"the window load event");
const iframe_2_onload = t.unreached_func("#iframe_2 should not load before " +
"the window load event");
window.addEventListener("load", t.step_func(() => {
const iframe_1 = document.querySelector('#iframe_1');
const iframe_2 = document.querySelector('#iframe_2');
const iframe_1_promise = new Promise((resolve, reject) => {
iframe_1.onerror = reject;
iframe_1.onload = resolve;
});
const iframe_2_promise = new Promise((resolve, reject) => {
iframe_2.onerror = reject;
iframe_2.onload = resolve;
});
Promise.all([iframe_1_promise, iframe_2_promise])
.then(t.step_func_done())
.catch(t.unreached_func("The iframes should load successfully"));
// Kick off the requests.
iframe_1.loading = 'eager';
iframe_2.removeAttribute('loading'); // unset the attribute, putting it in
// the default (eager) state.
}));
</script>
<body>
<div style="height:1000vh;"></div>
<iframe id="iframe_1"
src="resources/subframe.html?1"
loading="lazy" onload="iframe_1_onload();"></iframe>
<iframe id="iframe_2"
src="resources/subframe.html?2"
loading="lazy" onload="iframe_2_onload();"></iframe>
</body>
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