| <!DOCTYPE html> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <body> |
| <script> |
| |
| function verifyNumberOfDownloads(url, number) { |
| var numDownloads = 0; |
| let absoluteURL = new URL(url, location.href).href; |
| performance.getEntriesByName(absoluteURL).forEach(entry => { |
| if (entry.transferSize > 0) { |
| numDownloads++; |
| } |
| }); |
| assert_equals(numDownloads, number, url); |
| } |
| |
| function attachAndWaitForLoad(element) { |
| return new Promise((resolve, reject) => { |
| element.onload = resolve; |
| element.onerror = reject; |
| document.body.appendChild(element); |
| }); |
| } |
| |
| function attachAndWaitForError(element) { |
| return new Promise((resolve, reject) => { |
| element.onload = reject; |
| element.onerror = resolve; |
| document.body.appendChild(element); |
| }); |
| } |
| |
| promise_test(function(t) { |
| var link = document.createElement('link'); |
| link.rel = 'modulepreload'; |
| link.href = 'resources/dummy.js'; |
| return attachAndWaitForLoad(link).then(() => { |
| verifyNumberOfDownloads('resources/dummy.js', 1); |
| |
| // Verify that <script> doesn't fetch the module again. |
| var script = document.createElement('script'); |
| script.type = 'module'; |
| script.src = 'resources/dummy.js'; |
| return attachAndWaitForLoad(script); |
| }).then(() => { |
| verifyNumberOfDownloads('resources/dummy.js', 1); |
| }); |
| }, 'link rel=modulepreload'); |
| |
| promise_test(function(t) { |
| var link = document.createElement('link'); |
| link.rel = 'modulepreload'; |
| link.href = 'resources/module1.js'; |
| return attachAndWaitForLoad(link).then(() => { |
| // Currently, modulepreload doesn't perform submodules fetch. |
| verifyNumberOfDownloads('resources/module1.js', 1); |
| verifyNumberOfDownloads('resources/module2.js', 0); |
| |
| var script = document.createElement('script'); |
| script.type = 'module'; |
| script.src = 'resources/module1.js'; |
| return attachAndWaitForLoad(script); |
| }).then(() => { |
| verifyNumberOfDownloads('resources/module1.js', 1); |
| verifyNumberOfDownloads('resources/module2.js', 1); |
| }); |
| }, 'link rel=modulepreload with submodules'); |
| |
| promise_test(function(t) { |
| var link = document.createElement('link'); |
| link.rel = 'modulepreload'; |
| link.href = 'resources/syntax-error.js'; |
| return attachAndWaitForError(link); |
| }, 'link rel=modulepreload for a module with syntax error'); |
| |
| promise_test(function(t) { |
| var link = document.createElement('link'); |
| link.rel = 'modulepreload'; |
| link.href = 'resources/not-exist.js'; |
| return attachAndWaitForError(link); |
| }, 'link rel=modulepreload for a module with network error'); |
| |
| promise_test(function(t) { |
| var link = document.createElement('link'); |
| link.rel = 'modulepreload'; |
| link.href = null; |
| return attachAndWaitForError(link); |
| }, 'link rel=modulepreload with bad href attribute'); |
| |
| </script> |
| </body> |
