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<!DOCTYPE html>
<head>
<title>Iframes with loading='lazy' can be lazy loaded multiple times</title>
<link rel="author" title="Dom Farolino" href="mailto:dom@chromium.org">
<link rel="help" href="https://html.spec.whatwg.org/multipage/urls-and-fetching.html#lazy-loading-attributes">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<!-- This is used to represent the top of the viewport, so we can scroll the
below-viewport iframe out-of-view later in the test -->
<div id="top_div"></div>
<div style="height:1000vh;"></div>
<iframe id="below_viewport" loading="lazy" src="resources/unload-reporter.html?first"></iframe>
<script>
const t = async_test();
const iframe = document.querySelector('#below_viewport');
const top_div = document.querySelector('#top_div');
let has_window_load_fired = false;
let iframe_being_unloaded = false;
// This should be triggered first.
window.addEventListener('load', t.step_func(() => {
has_window_load_fired = true;
// Scroll the loading=lazy below-viewport iframe into view, so that it loads.
iframe.scrollIntoView();
}));
window.addEventListener('message', t.step_func(msg => {
if (msg.data === 'unloading')
iframe_being_unloaded = true;
}));
iframe.onload = t.step_func(() => {
assert_true(has_window_load_fired,
"The loading=lazy below-viewport iframe should not block the " +
"window load event");
changeIframeSourceAndScrollToTop();
});
function changeIframeSourceAndScrollToTop() {
top_div.scrollIntoView();
// Lazily load a "different" iframe.
iframe.src = 'resources/unload-reporter.html?second';
iframe.onload =
t.unreached_func("The loading=lazy below-viewport iframe should lazily " +
"load its second resource, and not load it eagerly " +
"when the `src` attribute is changed");
// In 1s, scroll the iframe *back* into view, and record that it loads
// successfully.
t.step_timeout(() => {
assert_false(iframe_being_unloaded,
"The iframe's old resource is not eagerly unloaded");
iframe.onload = t.step_func_done(() => {
assert_true(iframe_being_unloaded,
"The iframe's old resources was unloaded correctly");
});
iframe.scrollIntoView();
}, 1000);
}
</script>
</body>
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