blob: 4ec79936e477315bc652115eea9a28b6431cc4b7 (
plain)
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
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
<!-- Any copyright is dedicated to the Public Domain.
http://creativecommons.org/publicdomain/zero/1.0/ -->
<!doctype html>
<html>
<head>
<meta charset="utf-8"/>
<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
<meta http-equiv="Pragma" content="no-cache" />
<meta http-equiv="Expires" content="0" />
<title>Network Monitor test page</title>
<link rel="stylesheet" type="text/css" href="stylesheet_request" />
</head>
<body>
<p>Request cause test</p>
<img src="img_request" />
<img srcset="img_srcset_request" />
<!-- ensure that the two next <img> are offscreen
so that the error listener is registered before we try loading them -->
<div style="height: 2000vh;"></div>
<img loading="lazy" src="lazy_img_request" />
<img loading="lazy" srcset="lazy_img_srcset_request" />
<script type="text/javascript">
"use strict";
function performXhrRequest() {
const xhr = new XMLHttpRequest();
xhr.open("GET", "xhr_request", true);
return new Promise(function performXhrRequestCallback(resolve) {
xhr.onload = resolve;
xhr.send();
});
}
function performFetchRequest() {
return fetch("fetch_request");
}
// Perform some requests with async stacks
function performPromiseFetchRequest() {
return Promise.resolve().then(function performPromiseFetchRequestCallback() {
return fetch("promise_fetch_request");
});
}
function performTimeoutFetchRequest() {
return new Promise(function performTimeoutFetchRequestCallback1(resolve) {
setTimeout(function performTimeoutFetchRequestCallback2() {
resolve(fetch("timeout_fetch_request"));
}, 0);
});
}
function performFavicon() {
return new Promise(function (resolve) {
const link = document.createElement("link");
link.rel = "icon";
link.href = "favicon_request";
document.querySelector("head").appendChild(link);
link.addEventListener("devtools:test:favicon", resolve);
});
}
function performLazyLoadingImage() {
return new Promise(function (resolve) {
const lazyImgs = document.querySelectorAll("img[loading='lazy']");
const promises = [
new Promise(r => lazyImgs[0].addEventListener("error", r)),
new Promise(r => lazyImgs[1].addEventListener("error", r)),
];
// Given that the default display style of <img> is `inline` so
// it's sufficient to scroll to an <img>.
lazyImgs[0].scrollIntoView({ behavior: "instant" });
resolve(Promise.all(promises));
});
}
function performBeaconRequest() {
navigator.sendBeacon("beacon_request");
}
(async function() {
await performXhrRequest();
await performFetchRequest();
await performPromiseFetchRequest();
await performTimeoutFetchRequest();
await performFavicon();
await performLazyLoadingImage();
// Finally, send a beacon request
performBeaconRequest();
})();
</script>
</body>
</html>
|
