98 lines
3.2 KiB
HTML
98 lines
3.2 KiB
HTML
<!-- Any copyright is dedicated to the Public Domain.
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http://creativecommons.org/publicdomain/zero/1.0/ -->
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<!doctype html>
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<html>
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<head>
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<meta charset="utf-8"/>
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<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
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<meta http-equiv="Pragma" content="no-cache" />
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<meta http-equiv="Expires" content="0" />
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<title>Network Monitor test page</title>
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<link rel="stylesheet" type="text/css" href="stylesheet_request" />
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</head>
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<body>
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<p>Request cause test</p>
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<img src="img_request" />
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<img srcset="img_srcset_request" />
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<!-- ensure that the two next <img> are offscreen
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so that the error listener is registered before we try loading them -->
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<div style="height: 2000vh;"></div>
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<img loading="lazy" src="lazy_img_request" />
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<img loading="lazy" srcset="lazy_img_srcset_request" />
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<script type="text/javascript">
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"use strict";
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function performXhrRequest() {
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const xhr = new XMLHttpRequest();
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xhr.open("GET", "xhr_request", true);
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return new Promise(function performXhrRequestCallback(resolve) {
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xhr.onload = resolve;
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xhr.send();
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});
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}
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function performFetchRequest() {
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return fetch("fetch_request");
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}
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// Perform some requests with async stacks
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function performPromiseFetchRequest() {
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return Promise.resolve().then(function performPromiseFetchRequestCallback() {
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return fetch("promise_fetch_request");
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});
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}
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function performTimeoutFetchRequest() {
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return new Promise(function performTimeoutFetchRequestCallback1(resolve) {
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setTimeout(function performTimeoutFetchRequestCallback2() {
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resolve(fetch("timeout_fetch_request"));
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}, 0);
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});
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}
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function performFavicon() {
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return new Promise(function (resolve) {
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const link = document.createElement("link");
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link.rel = "icon";
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link.href = "favicon_request";
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document.querySelector("head").appendChild(link);
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link.addEventListener("devtools:test:favicon", resolve);
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});
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}
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function performLazyLoadingImage() {
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return new Promise(function (resolve) {
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const lazyImgs = document.querySelectorAll("img[loading='lazy']");
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const promises = [
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new Promise(r => lazyImgs[0].addEventListener("error", r)),
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new Promise(r => lazyImgs[1].addEventListener("error", r)),
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];
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// Given that the default display style of <img> is `inline` so
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// it's sufficient to scroll to an <img>.
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lazyImgs[0].scrollIntoView({ behavior: "instant" });
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resolve(Promise.all(promises));
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});
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}
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function performBeaconRequest() {
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navigator.sendBeacon("beacon_request");
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}
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(async function() {
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await performXhrRequest();
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await performFetchRequest();
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await performPromiseFetchRequest();
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await performTimeoutFetchRequest();
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await performFavicon();
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await performLazyLoadingImage();
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// Finally, send a beacon request
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performBeaconRequest();
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})();
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</script>
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</body>
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</html>
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