How to use startPrerendering method in wpt

Best JavaScript code snippet using wpt

utils.js

Source:utils.js

...7      HTMLScriptElement.supports('speculationrules'),8      '<script type="speculationrules"> is not supported');9}10// Starts prerendering for `url`.11function startPrerendering(url) {12  // Adds <script type="speculationrules"> and specifies a prerender candidate13  // for the given URL.14  // TODO(https://crbug.com/1174978): <script type="speculationrules"> may not15  // start prerendering for some reason (e.g., resource limit). Implement a16  // WebDriver API to force prerendering.17  const script = document.createElement('script');18  script.type = 'speculationrules';19  script.text = `{"prerender": [{"source": "list", "urls": ["${url}"] }] }`;20  document.head.appendChild(script);21}22// Reads the value specified by `key` from the key-value store on the server.23async function readValueFromServer(key) {24  const serverUrl = `${STORE_URL}?key=${key}`;25  const response = await fetch(serverUrl);26  if (!response.ok)27    throw new Error('An error happened in the server');28  const value = await response.text();29  // The value is not stored in the server.30  if (value === "")31    return { status: false };32  return { status: true, value: value };33}34// Convenience wrapper around the above getter that will wait until a value is35// available on the server.36async function nextValueFromServer(key) {37  while (true) {38    // Fetches the test result from the server.39    const { status, value } = await readValueFromServer(key);40    if (!status) {41      // The test result has not been stored yet. Retry after a while.42      await new Promise(resolve => setTimeout(resolve, 100));43      continue;44    }45    return value;46  }47}48// Writes `value` for `key` in the key-value store on the server.49async function writeValueToServer(key, value) {50  const serverUrl = `${STORE_URL}?key=${key}&value=${value}`;51  await fetch(serverUrl);52}53// Loads the initiator page, and navigates to the prerendered page after it54// receives the 'readyToActivate' message.55function loadInitiatorPage() {56  // Used to communicate with the prerendering page.57  const prerenderChannel = new BroadcastChannel('prerender-channel');58  window.addEventListener('unload', () => {59    prerenderChannel.close();60  });61  // We need to wait for the 'readyToActivate' message before navigation62  // since the prerendering implementation in Chromium can only activate if the63  // response for the prerendering navigation has already been received and the64  // prerendering document was created.65  const readyToActivate = new Promise((resolve, reject) => {66    prerenderChannel.addEventListener('message', e => {67      if (e.data != 'readyToActivate')68        reject(`The initiator page receives an unsupported message: ${e.data}`);69      resolve(e.data);70    });71  });72  const url = new URL(document.URL);73  url.searchParams.append('prerendering', '');74  // Prerender a page that notifies the initiator page of the page's ready to be75  // activated via the 'readyToActivate'.76  startPrerendering(url.toString());77  // Navigate to the prerendered page after being informed.78  readyToActivate.then(() => {79    window.location = url.toString();80  }).catch(e => {81    const testChannel = new BroadcastChannel('test-channel');82    testChannel.postMessage(83        `Failed to navigate the prerendered page: ${e.toString()}`);84    testChannel.close();85    window.close();86  });87}88// Returns messages received from the given BroadcastChannel89// so that callers do not need to add their own event listeners.90// nextMessage() returns a promise which resolves with the next message....

referrer-test.js

Source:referrer-test.js

...5      resolve(e.data);6    }, {once: true});7  });8  // Start prerendering a page that will echo its referrer.9  startPrerendering(`resources/echo-referrer.py`);10  const result = await gotMessage;11  assert_equals(result.referrer, expected, 'referrer');...

Using AI Code Generation

1var wpt = require('webpagetest');2var wpt = new WebPageTest('www.webpagetest.org');3    if (err) {4        console.log('Error: ' + err);5    } else {6        console.log('Prerendering started: ' + data);7    }8});9var wpt = require('webpagetest');10var wpt = new WebPageTest('www.webpagetest.org');11    if (err) {12        console.log('Error: ' + err);13    } else {14        console.log('Prerendering status: ' + data);15    }16});17var wpt = require('webpagetest');18var wpt = new WebPageTest('www.webpagetest.org');19    if (err) {20        console.log('Error: ' + err);21    } else {22        console.log('Prerendering stopped: ' + data);23    }24});25var wpt = require('webpagetest');26var wpt = new WebPageTest('www.webpagetest.org');27wpt.getLocations(function(err, data) {28    if (err) {29        console.log('Error: ' + err);30    } else {31        console.log('Locations: ' + data);32    }33});34var wpt = require('webpagetest');35var wpt = new WebPageTest('www.webpagetest.org');36wpt.getTesters(function(err, data) {37    if (err) {38        console.log('Error: ' + err);39    } else {40        console.log('Testers: ' + data);41    }42});43var wpt = require('webpagetest');44var wpt = new WebPageTest('

Using AI Code Generation

1var wpt = require('webpagetest');2var webPageTest = new wpt('www.webpagetest.org', 'API_KEY');3    if (err) {4        console.log(err);5    } else {6        console.log(data);7    }8});9var wpt = require('webpagetest');10var webPageTest = new wpt('www.webpagetest.org', 'API_KEY');11    if (err) {12        console.log(err);13    } else {14        console.log(data);15    }16});17var wpt = require('webpagetest');18var webPageTest = new wpt('www.webpagetest.org', 'API_KEY');19    if (err) {20        console.log(err);21    } else {22        console.log(data);23    }24});25var wpt = require('webpagetest');26var webPageTest = new wpt('www.webpagetest.org', 'API_KEY');27    if (err) {28        console.log(err);29    } else {30        console.log(data);31    }32});33var wpt = require('webpagetest');34var webPageTest = new wpt('www.webpagetest.org', 'API_KEY');35    if (err) {36        console.log(err);37    } else {38        console.log(data);39    }40});41var wpt = require('webpagetest');42var webPageTest = new wpt('

Using AI Code Generation

1var wptdriver = require('wptdriver');2  if (err) {3    console.log(err);4  }5});6var wptdriver = require('wptdriver');7wptdriver.stopPrerendering(function (err) {8  if (err) {9    console.log(err);10  }11});

Using AI Code Generation

1var wpt = require('wpt');2  console.log(data);3});4var wpt = require('wpt');5  console.log(data);6});7var wpt = require('wpt');8  console.log(data);9});10var wpt = require('wpt');11  console.log(data);12});13var wpt = require('wpt');14wpt.getLocations(function(data) {15  console.log(data);16});17var wpt = require('wpt');18wpt.getTests(function(data) {19  console.log(data);20});21var wpt = require('wpt');22  console.log(data);23});24var wpt = require('wpt');25  console.log(data);26});27var wpt = require('wpt');28  console.log(data);29});30var wpt = require('wpt');31  console.log(data);32});33var wpt = require('wpt');34  console.log(data);35});36var wpt = require('wpt');

Using AI Code Generation

1const wpt = require('wpt-api');2const wpt = new WptApi();3    console.log(data);4});5    console.log(data);6});7    console.log(data);8});9const wpt = require('wpt-api');10const wpt = new WptApi();11    console.log(data);12});13const wpt = require('wpt-api');14const wpt = new WptApi();15    console.log(data);16});

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