This is the test suites from a number of W3C Working Groups, including the HTML Working Group, the Web Apps Working Group, the Device APIs Working Group, and the Web Apps Security Working Group.
Running the Tests
The tests are designed to be run from your local computer. The test environment requires Python 2.7+ (but not Python 3.x).
To get the tests running, you need to set up the test domains in your
hosts file. The following entries are required:
127.0.0.1 web-platform.test 127.0.0.1 www.web-platform.test 127.0.0.1 www1.web-platform.test 127.0.0.1 www2.web-platform.test 127.0.0.1 xn--n8j6ds53lwwkrqhv28a.web-platform.test 127.0.0.1 xn--lve-6lad.web-platform.test
Because web-platform-tests uses git submodules, you must ensure that these are up to date. In the root of your checkout, run:
git submodule update --init --recursive
The test environment can then be started using
This will start HTTP servers on two ports and a websockets server on
one port. By default one web server starts on port 8000 and the other
ports are randomly-chosen free ports. Tests must be loaded from the
first HTTP server in the output. To change the ports, edit the
config.json file, for example, replacing the part that reads:
"http": [8000, "auto"]
to some port of your choice e.g.
There is a test runner that is designed to provide a convenient way to run the web-platform tests in-browser. It will run testharness.js tests automatically but requires manual work for reftests and manual tests.
In order to use the runner, it is first necessary to generate a test
manifest. This must be called
MANIFEST.json and placed in the
You must do this step to use the test runner, even if you are not creating a new test suite.
To generate this file, from a command prompt at the root directory of the repo, run:
tools/scripts/manifest.py needs python
If you have not installed it yet, run:
pip install html5lib
On Mac OS X, python is installed with Xcode, but pip is not. Try
sudo easy_install pip
if pip is not already on your system.
Running the tests requires that the test environment be activated as
described above. The runner can be found at
on the local server i.e.
in the default configuration.
The master branch is automatically synced to http://w3c-test.org/.
Pull requests that have been checked are automatically mirrored to http://w3c-test.org/submissions/.
Each top-level directory represents a W3C specification: the name matches the shortname used after the canonical address of the said specification under http://www.w3.org/TR/ .
For some of the specifications, the tree under the top-level directory represents the sections of the respective documents, using the section IDs for directory names, with a maximum of three levels deep.
So if you're looking for tests in HTML for "The History interface",
they will be under
Various resources that tests depend on are in
If you're looking at a section of the specification and can't figure out where the directory is for it in the tree, just run:
node tools/scripts/id2path.js your-id
In the vast majority of cases the only branch that you should need
to care about is
There is another branch called
CR. This is a strict subset of
master that is limited to features that are found in the Candidate
Recommendation version of the relevant specifications.
If you see other branches in the repository, you can generally safely
ignore them. Please note that branches prefixed with
temporary branches and can get deleted at some point. So don't
base any work off them unless you want to see your work destroyed.
Save the Web, Write Some Tests!
Absolutely everyone is welcome (and even encouraged) to contribute to test development, so long as you fulfill the contribution requirements detailed in the Contributing Guidelines. No test is too small or too simple, especially if it corresponds to something for which you've noted an interoperability bug in a browser.
The way to contribute is just as usual:
- fork this repository (and make sure you're still relatively in sync with it if you forked a while ago);
- create a branch for your changes:
git checkout -b your-name/topic;
- make your changes;
- push that to your repo;
- and send in a pull request based on the above.
Please make your pull requests either to
master or to a feature
branch (but not to
We can sometimes take a little while to go through pull requests because we have to go through all the tests and ensure that they match the specification correctly. But we look at all of them, and take everything that we can.