| # Running Tests from the Web |
| |
| Tests that have been merged on GitHub are mirrored at |
| [wpt.live](https://wpt.live) and [w3c-test.org](https://w3c-test.org). |
| [On properly-configured systems](from-local-system), local files may also be |
| served from the URL [http://web-platform.test](http://web-platform.test). |
| |
| Not all tests can be executed in-browser, as some tests rely on automation |
| (e.g. via [testdriver.js](../writing-tests/testdriver)) that is not available |
| when running a browser in a normal user session. |
| |
| ## Web test runner |
| |
| For running multiple tests inside a browser, there is a test runner |
| located at `/tools/runner/index.html`. |
| |
| This allows all the tests, or those matching a specific prefix |
| (e.g. all tests under `/dom/`) to be run. For testharness.js tests, |
| the results will be automatically collected, while the runner |
| provides a simple UI for manually comparing reftest rendering and |
| running manual tests. |
| |
| Note, however, it does not currently handle more complex reftests with |
| more than one reference involved. |
| |
| Because it runs entirely in-browser, this runner cannot deal with |
| edge-cases like tests that cause the browser to crash or hang. |
