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image-loading-eager.tentative.html
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image-loading-eager.tentative.html
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<!DOCTYPE html>
<head>
<title>Images with loading='eager' load immediately regardless of their position with respect to the viewport</title>
<link rel="author" title="Scott Little" href="mailto:sclittle@chromium.org">
<link rel="help" href="https://github.com/scott-little/lazyload">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<!--
Marked as tentative until https://github.com/whatwg/html/pull/3752 is landed.
-->
<script>
const t = async_test("Test that images with loading='eager' load immediately regardless of their position with respect to the viewport.");
let has_in_viewport_loaded = false;
const in_viewport_img_onload = t.step_func(function() {
assert_false(has_in_viewport_loaded, "The in_viewport element should load only once.");
has_in_viewport_loaded = true;
});
let has_below_viewport_loaded = false;
const below_viewport_img_onload = t.step_func(function() {
assert_false(has_below_viewport_loaded, "The below_viewport element should load only once.");
has_below_viewport_loaded = true;
});
window.addEventListener("load", t.step_func_done(function() {
assert_true(has_in_viewport_loaded, "The in_viewport element should have loaded before window.load().");
assert_true(has_below_viewport_loaded, "The below_viewport element should have loaded before window.load().");
}));
</script>
<body>
<img id="in_viewport" src="resources/image.png?first" loading="eager" onload="in_viewport_img_onload();">
<div style="height:10000px;"></div>
<!--
The below_viewport element loads very slowly in order to ensure that the
window load event is blocked on it.
-->
<img id="below_viewport" src="resources/image.png?pipe=trickle(d2)" loading="eager" onload="below_viewport_img_onload();">
</body>