<!DOCTYPE html> <html> <head> <title>Navigation Timing Transfert Size of Prefetched Page</title> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <script src="/common/utils.js"></script> <script src="/common/dispatcher/dispatcher.js"></script> </head> <body> <script> function add_iframe(url) { return new Promise(resolve => { const frame = document.createElement('iframe'); frame.src = url; frame.addEventListener('load', () => { resolve(frame); }, { once: true }); document.body.appendChild(frame); }); }; promise_test(async t => { // Add an iframe let iframe_url = 'resources/iframe-prefetch-transfer-size.html'; frame = await add_iframe(iframe_url) // Prefetch a url as link element. await frame.contentWindow.addLink(); // navigate to the prefetched url. await new Promise(resolve => { frame.addEventListener('load', () => { resolve(); }, { once: true }); frame.contentWindow.navigateToPrefetchedUrl(); }); // Verify navigation timing transfer size is 0.; let transferSize = frame.contentWindow.performance.getEntriesByType('navigation')[0].transferSize; assert_equals(transferSize, 0); }, "Navigation timing transfer size for a prefetched navigation should be 0."); </script> </body> </html>