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<!DOCTYPE html>
<head>
<title>In-viewport loading=lazy iframes do not block the window load event</title>
<link rel="author" title="Dom Farolino" href="mailto:dom@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../resources/common.js"></script>
</head>
<body>
<!-- This image blocks the window load event for 1 second -->
<img src="/common/square.png?pipe=trickle(d1)">
<!-- These iframes must load because they intersect the viewport, but they must
not block the window load event, because they are loading=lazy -->
<iframe id="visible" loading="lazy"
src="resources/subframe.html?visible&pipe=trickle(d3)"></iframe>
<iframe id="visibility_hidden" style="visibility:hidden;" loading="lazy"
src="resources/subframe.html?visibility_hidden&pipe=trickle(d3)"></iframe>
</body>
<script>
const visible_iframe = document.querySelector('#visible');
const hidden_iframe = document.querySelector('#visibility_hidden');
const visible_iframe_t =
async_test('In-viewport loading=lazy iframe does not block the load event');
const hidden_iframe_t =
async_test('In-viewport loading=lazy visibility:hidden iframe does not ' +
'block the load event');
let has_window_loaded = false;
window.addEventListener("load", () => {
has_window_loaded = true;
});
visible_iframe.onload = visible_iframe_t.step_func_done(() => {
assert_true(has_window_loaded,
"The visible iframe should not block the load event");
});
hidden_iframe.onload = hidden_iframe_t.step_func_done(() => {
assert_true(has_window_loaded,
"The hidden iframe should not block the load event");
});
</script>
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