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<!DOCTYPE html>
<head>
<title>Below-viewport loading=lazy images do not block the window load event
when scrolled into viewport</title>
<link rel="author" title="Rob Buis" href="mailto:rbuis@igalia.com">
<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>
<!-- When this image loads, we will scroll the below-viewport loading=lazy
images into the viewport. This happens before the window load event is
fired -->
<img id="scroll_trigger"
src="resources/image.png?scroll-trigger&pipe=trickle(d1)"
onload="scroll_trigger_img.resolve();" onerror="scroll_trigger_img.reject();">
<!-- This image blocks the window load event for 2 seconds -->
<img src="resources/image.png?window-load-blocking&pipe=trickle(d2)">
<div style="height:1000vh"></div>
<!-- These images must load because they intersect the viewport, but they must
not block the window load event, because they are loading=lazy -->
<img id="visible"
src="resources/image.png?visible&pipe=trickle(d3)" loading="lazy"
onload="visible_img.resolve();" onerror="visible_img.reject();">
<img id="visibility_hidden" style="visibility:hidden;"
src="resources/image.png?visibility_hidden&pipe=trickle(d3)" loading="lazy"
onload="visibility_hidden_img.resolve();" onerror="visibility_hidden_img.reject();">
</body>
<script>
const scroll_trigger_img = new ElementLoadPromise("visible");
const visible_img = new ElementLoadPromise("visible");
const visibility_hidden_img = new ElementLoadPromise("visibility_hidden");
async_test(t => {
let has_window_loaded = false;
scroll_trigger_img.promise
.then(t.step_func(() => {
assert_false(has_window_loaded,
"The scroll_trigger image should load before the window " +
"load event fires");
visibility_hidden_img.element().scrollIntoView();
}))
.catch(t.unreached_func("The scroll_trigger image should load"));
window.addEventListener("load", t.step_func(() => {
has_window_loaded = true;
}));
Promise.all([visible_img.promise, visibility_hidden_img.promise])
.then(t.step_func_done(() => {
assert_true(has_window_loaded,
"The window load event should fire before the " +
"below-viewport loading=lazy images load");
assert_true(visible_img.element().complete,
"The below-viewport loading=lazy visible image is complete");
assert_true(visibility_hidden_img.element().complete,
"The below-viewport loading=lazy visibility:hidden image is complete");
}))
.catch(t.unreached_func("The images should load successfully"));
}, "Below-viewport loading=lazy images do not block the window load event when " +
"scrolled into viewport");
</script>
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