1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
<!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>
<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(() => {
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(() => {
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(() => {
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?in-viewport" 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?below-viewport&pipe=trickle(d2)"
loading="eager" onload="below_viewport_img_onload();">
</body>
|
