Test suites for Web platform specs — including WHATWG, W3C, and others
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.well-known Origin Policy: Web Platform Tests for Origin Policy w/ CSP. Aug 6, 2018
2dcontext Fix textBaseline alignment to match the spec for top/bottom/middle. Aug 31, 2018
BackgroundSync Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
FileAPI Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
IndexedDB Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
WebCryptoAPI Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
WebIDL Add spec links to META.yml Jul 17, 2018
accelerometer Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
accname accname: Fix expectations of three tests Sep 13, 2018
acid Rename of OWNER files to META.yml Jun 12, 2018
ambient-light Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
animation-worklet Update the Animation Worklet IDL file + test (#12444) Aug 13, 2018
annotation-model Add more spec links to META.yml (#12045) Jul 18, 2018
annotation-protocol Add more spec links to META.yml (#12045) Jul 18, 2018
annotation-vocab Update nokogiri version Aug 8, 2018
apng Add more spec links to META.yml (#12045) Jul 18, 2018
appmanifest Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
async-local-storage [Layered API] Update async local storage implementation and tests Aug 17, 2018
audio-output Add spec links to META.yml Jul 17, 2018
background-fetch [Background Fetch] Set bad-status as failureReason Sep 20, 2018
battery-status [Battery] Correct IDL file name (#12422) Aug 13, 2018
beacon Fetch/XHR/Beacon: test locked/disturbed ReadableStream Aug 24, 2018
bluetooth Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
clear-site-data WPT for Clear-Site-Data executionContexts Aug 2, 2018
client-hints Modify source path for wpt test of Accept-CH Aug 23, 2018
clipboard-apis Add spec links to META.yml Jul 17, 2018
common HTML: document.open() and aborting documents (#10789) Sep 6, 2018
compat Notify andruud on changes to wpt/css/css-properties-values-api. Aug 30, 2018
conformance-checkers cc Update messages.json Jul 21, 2018
console Convert compat+console+fullscreen+storage+url+xhr to idl_test (#12405) Aug 10, 2018
content-security-policy Implemented the correct 'self' matching logic according to the spec Sep 17, 2018
cookie-store cookie-store: add tests for cross-origin Sep 13, 2018
cookies [cookies] Correct utility function and tests (#12835) Sep 6, 2018
core-aam ARIA: Add team contact to suggested reviewers for wai-aria and core-a… Jul 19, 2018
cors Fetch: align CORS test with new "safelisted headers" rules Sep 5, 2018
credential-management Add spec links to META.yml Jul 17, 2018
css Merge pull request #13159 from web-platform-tests/fix-mplus-1p-regular Sep 21, 2018
custom-elements Implement step 1 of "look up a custom element definition" Sep 13, 2018
device-memory Add spec links to META.yml Jul 17, 2018
docs Fix grammar mistake docs Sep 22, 2018
dom wpt: Create EventListener-addEventListener test. Sep 20, 2018
domparsing Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
domxpath Add more spec links to META.yml (#12045) Jul 18, 2018
dpub-aam Add more spec links to META.yml (#12045) Jul 18, 2018
dpub-aria Add more spec links to META.yml (#12045) Jul 18, 2018
editing Set longer timeout to all tests in wpt/editing/run/ Sep 5, 2018
encoding Implement TextEncoderStream and TextDecoderStream Sep 4, 2018
encrypted-media [eme] Ensure license is expired before using it (#8623) Sep 3, 2018
entries-api Add spec links to META.yml Jul 17, 2018
eventsource Tweak URLs for directories for parts of WHATWG standards Jul 17, 2018
feature-policy Timeout 400ms Sep 14, 2018
fetch Fetch: Object.prototype shouldn't interfere with fetch streams Sep 20, 2018
fonts Rename of OWNER files to META.yml Jun 12, 2018
fullscreen part 4 - Fix a wpt of exitFullscreen to check against the right Promise. Sep 19, 2018
gamepad Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
generic-sensor Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
geolocation-API Add spec links to META.yml Jul 17, 2018
geolocation-sensor Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
graphics-aam Add more spec links to META.yml (#12045) Jul 18, 2018
gyroscope Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
hr-time Merge pull request #8488 from divmain/hr-time-origin-tests Sep 3, 2018
html-longdesc Add more spec links to META.yml (#12045) Jul 18, 2018
html-media-capture Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
html Unbreak html/dom/interfaces.https.html Sep 22, 2018
imagebitmap-renderingcontext Tweak URLs for directories for parts of WHATWG standards Jul 17, 2018
images Remove reviewers who have not joined the web-platform-tests org (#11888) Jul 11, 2018
inert Move inert tests to top level directory and rename with .tentative Aug 30, 2018
infrastructure Remove kereliuk from suggested reviewers (#12829) Sep 4, 2018
input-device-capabilities Convert Input Device Capabilities IDL test to use idl_test (#12576) Aug 27, 2018
input-events Convert Input Events IDL test to use idl_test (#12572) Aug 21, 2018
interfaces Update interfaces/SVG.idl (#13175) Sep 23, 2018
intersection-observer Loosen timing expectation in IntersectionObserver WPTs Sep 11, 2018
js Add more spec links to META.yml (#12045) Jul 18, 2018
keyboard-lock Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
keyboard-map Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
lifecycle Add some more spec links manually Jul 17, 2018
longtask-timing Add spec links to META.yml Jul 17, 2018
magnetometer Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
mathml Add spec links to META.yml Jul 17, 2018
media-capabilities Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
media-source MSE: Make changeType-play layout tests' audio mime-type be audio-spec… Aug 8, 2018
media Ship CreateImageBitmap resize options Aug 13, 2018
mediacapture-depth Add spec links to META.yml Jul 17, 2018
mediacapture-fromelement Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
mediacapture-image [Image Capture] Add exposureTime constraint. Sep 18, 2018
mediacapture-record Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
mediacapture-streams WebKit export of https://bugs.webkit.org/show_bug.cgi?id=189516 Sep 19, 2018
mediasession Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
mimesniff MIME Sniffing: quoted empty string Sep 14, 2018
mixed-content Add more WPT tests for mixed-content check in workers/worklets (2/2) Sep 11, 2018
mst-content-hint Enable the "Content hint" attribute of MediaStreamTrack Aug 16, 2018
navigation-timing Remove redundant idlharness.js for Navigation Timing (#12434) Aug 14, 2018
netinfo Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
network-error-logging Add comment describing shared lock for NEL tests Aug 30, 2018
notifications Avoid invoking the Notification constructor in service workers (#12500) Aug 15, 2018
offscreen-canvas Tweak URLs for directories for parts of WHATWG standards Jul 17, 2018
old-tests Try less trailing newlines Aug 6, 2018
orientation-event Add spec links to META.yml Jul 17, 2018
orientation-sensor Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
origin-policy Origin Policy: Web Platform Tests for Origin Policy w/ CSP. Aug 6, 2018
page-visibility Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
paint-timing Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
payment-handler Remove languageCode tests (#12684) Sep 21, 2018
payment-method-basic-card Remove languageCode tests (#12684) Sep 21, 2018
payment-method-id Add spec links to META.yml Jul 17, 2018
payment-request Remove languageCode tests (#12684) Sep 21, 2018
performance-timeline Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
permissions Add spec links to META.yml Jul 17, 2018
picture-in-picture Add pictureInPictureWindow to enterpictureinpicture event. Sep 21, 2018
pointerevents Use NotFoundError instead of InvalidPointerId Sep 20, 2018
pointerlock Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
preload Implement script and style attr/elem CSP directives Sep 5, 2018
presentation-api [presentation-api] Modify the test to check NotFoundError on reconnec… Sep 13, 2018
priority-hints Add more suggested reviewers for Priority Hints Aug 7, 2018
proximity Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
push-api Rename idlharness tests for [SecureContext] APIs to .https. (#12353) Aug 8, 2018
quirks More properties do not accept number Aug 29, 2018
referrer-policy Add spec links to META.yml Jul 17, 2018
remote-playback Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
reporting Add Reporting API IDL file + test (#12496) Aug 15, 2018
requestidlecallback Add spec links to META.yml Jul 17, 2018
resize-observer Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
resource-timing Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
resources Don't try to parse the contents of server errors in idl_test(). Sep 21, 2018
screen-capture Add observable settings for getDisplayMedia() Aug 31, 2018
screen-orientation Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
scroll-animations Convert Scroll-linked Animations IDL test to use idl_test (#12575) Aug 21, 2018
secure-contexts Rewrite secure-contexts/idlharness.any.js to use idl_test (#12386) Aug 9, 2018
selection Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
server-timing add cvazac as suggested reviewer, fix whitesapce to align with cvazac… Jul 24, 2018
service-workers [service-workers] Return value in cleanup (#13163) Sep 21, 2018
shadow-dom radio groups should work in shadow DOM Sep 21, 2018
shape-detection Add some more spec links manually Jul 17, 2018
speech-api Add tests for SpeechSynthesis pause() and resume() (#12992) Sep 14, 2018
storage Storage API: Register "persistent-storage" permission string Aug 30, 2018
streams Remove and replace obsolete ESLint rules. Sep 4, 2018
subresource-integrity Fix dependency order in subresource-integrity/idlharness.window.js (#… Aug 13, 2018
svg-aam Add more spec links to META.yml (#12045) Jul 18, 2018
svg SVG elements don't implement the click method Sep 20, 2018
tools Set up infra so we can move the wpt-manifest out of tree Sep 21, 2018
touch-events Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
trusted-types DOMWindowTimers::setTimeout and setInterval modified to accept Trusted Sep 16, 2018
uievents Rewrite UI Events IDL test to use idl_test Aug 14, 2018
upgrade-insecure-requests Add spec links to META.yml Jul 17, 2018
url Remove duplicated 'var's in urlsearchparams-constructor.any.js. Aug 21, 2018
user-timing [UserTiming] Correct measure where start is undefined Aug 23, 2018
vibration Rewrite Vibration API IDL test to use idl_test (#12433) Aug 14, 2018
visual-viewport Add spec links to META.yml Jul 17, 2018
wai-aria Add IDL tests for WAI-ARIA (#12822) Sep 4, 2018
wake-lock Wake Lock API: Implement Screen WakeLock based on Promises. Aug 18, 2018
wasm Share tests between new WebAssembly.Instance() and WebAssembly.instan… Sep 22, 2018
web-animations [testharness.js] Disallow `test` return value (#12958) Sep 17, 2018
web-locks Web Locks API: Run tests in additional globals Sep 11, 2018
web-nfc Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
web-share Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
webaudio Set default channel count for AnalyserNode to 2 Sep 20, 2018
webauthn Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
webdriver [wdspec] Add tests for null input source and missing duration for pau… Sep 21, 2018
webgl Update WebGL IDL files + tests (#12499) Aug 15, 2018
webmessaging Add ability to send user activation context to message port and workers. Aug 22, 2018
webmidi Add the webmidi IDL file + test (#9841) Aug 3, 2018
webrtc-stats Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
webrtc Throw SyntaxError on empty urls in iceServers and switch to real Synt… Sep 18, 2018
websockets [WebSocket] Fix cookies/006.html?wss wpt Sep 4, 2018
webstorage Remove the idl_test test_name argument (always 'idl_test setup') (#12406 Aug 13, 2018
webusb Add validation to the requestDevice filters Aug 31, 2018
webvr Add more spec links to META.yml (#12045) Jul 18, 2018
webvtt Rewrite WebVTT IDL tests to use idl_test (#12436) Aug 14, 2018
webxr Reland "Move XR LayoutTests over to be WPTs" Aug 23, 2018
workers Impose strict MIME-type checks on `importScripts()`. Sep 3, 2018
worklets Add AudioWorklet tests to WPT. Aug 29, 2018
x-frame-options Fix x-frame-options WPTs Sep 19, 2018
xhr Fetch/XHR: test parsing of WWW-Authenticate response header Sep 14, 2018
.codecov.yml Add codecov configutation. (#5623) Apr 24, 2017
.gitignore Add .tox to global .gitignore Mar 22, 2018
.gitmodules Fix #7200: Update vendored html5lib to 1.0.1 Jun 6, 2018
.pyup.yml Support wpt run safari (Safari 11 and Technology Preview) (#8979) Mar 1, 2018
.taskcluster.yml Run stable daily and beta weekly (#13147) Sep 21, 2018
.travis.yml Stop posting PR results to pulls.web-platform-tests.org (#11060) May 18, 2018
CODEOWNERS Add CODEOWNERS to prevent submodule issues May 24, 2018
CONTRIBUTING.md Use https://web-platform-tests.org (#10925) May 9, 2018
LICENSE.md Fix the first header in the license file (#5244) Mar 28, 2017
README.md Use .tar.gz for test archives Aug 2, 2018
check_stability.ini Stop posting PR results to pulls.web-platform-tests.org (#11060) May 18, 2018
lint.whitelist Revert "bindings: Implement timers with V8Function" Sep 21, 2018
serve.py Add a warning when running ./serve when tools.serve cannot be imported ( Oct 30, 2016
server-side.md Make tests self-hosting Jan 6, 2014
testharness_runner.html Add testharness_runner file here for now. Apr 17, 2015
update-built-tests.sh Delete unbuilt css3-selectors tests; move built tests up Aug 24, 2018
wpt Add a wpt command as a frontend to all cli interactions. Jul 26, 2017
wpt.py Allow |python wpt <command>| to work on Windows. Aug 16, 2017

README.md

The web-platform-tests Project IRC chat

The web-platform-tests Project is a W3C-coordinated attempt to build a cross-browser testsuite for the Web-platform stack. Writing tests in a way that allows them to be run in all browsers gives browser projects confidence that they are shipping software that is compatible with other implementations, and that later implementations will be compatible with their implementations. This in turn gives Web authors/developers confidence that they can actually rely on the Web platform to deliver on the promise of working across browsers and devices without needing extra layers of abstraction to paper over the gaps left by specification editors and implementors.

Setting Up the Repo

Clone or otherwise get https://github.com/web-platform-tests/wpt.

Note: because of the frequent creation and deletion of branches in this repo, it is recommended to "prune" stale branches when fetching updates, i.e. use git pull --prune (or git fetch -p && git merge).

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).

On Windows, be sure to add the Python directory (c:\python2x, by default) to your %Path% Environment Variable, and read the Windows Notes section below.

To get the tests running, you need to set up the test domains in your hosts file.

The necessary content can be generated with ./wpt make-hosts-file; on Windows, you will need to precede the prior command with python or the path to the Python binary (python wpt make-hosts-file).

For example, on most UNIX-like systems, you can setup the hosts file with:

./wpt make-hosts-file | sudo tee -a /etc/hosts

And on Windows (this must be run in a PowerShell session with Administrator privileges):

python wpt make-hosts-file | Out-File $env:systemroot\System32\drivers\etc\hosts -Encoding ascii -Append

If you are behind a proxy, you also need to make sure the domains above are excluded from your proxy lookups.

Running Tests Manually

The test server can be started using

./wpt serve

On Windows: You will need to precede the prior command with python or the path to the python binary.

python wpt serve

This will start HTTP servers on two ports and a websockets server on one port. By default the web servers start on ports 8000 and 8443 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, create a config.json file in the wpt root directory, and add port definitions of your choice e.g.:

{
  "ports": {
    "http": [1234, "auto"],
    "https":[5678]
  }
}

After your hosts file is configured, the servers will be locally accessible at:

http://web-platform.test:8000/
https://web-platform.test:8443/ *

*See Trusting Root CA

Running Tests Automatically

Tests can be run automatically in a browser using the run command of the wpt script in the root of the checkout. This requires the hosts file setup documented above, but you must not have the test server already running when calling wpt run. The basic command line syntax is:

./wpt run product [tests]

On Windows: You will need to precede the prior command with python or the path to the python binary.

python wpt run product [tests]

where product is currently firefox or chrome and [tests] is a list of paths to tests. This will attempt to automatically locate a browser instance and install required dependencies. The command is very configurable; for example to specify a particular binary use wpt run --binary=path product. The full range of options can be see with wpt run --help and wpt run --wptrunner-help.

Not all dependencies can be automatically installed; in particular the certutil tool required to run https tests with Firefox must be installed using a system package manager or similar.

On Debian/Ubuntu certutil may be installed using:

sudo apt install libnss3-tools

And on macOS with homebrew using:

brew install nss

On other platforms, download the firefox archive and common.tests.tar.gz archive for your platform from Mozilla CI.

Then extract certutil[.exe] from the tests.tar.gz package and libnss3[.so|.dll|.dynlib] and put the former on your path and the latter on your library path.

Command Line Tools

The wpt command provides a frontend to a variety of tools for working with and running web-platform-tests. Some of the most useful commands are:

  • wpt serve - For starting the wpt http server
  • wpt run - For running tests in a browser
  • wpt lint - For running the lint against all tests
  • wpt manifest - For updating or generating a MANIFEST.json test manifest
  • wpt install - For installing the latest release of a browser or webdriver server on the local machine.

Submodules

Some optional components of web-platform-tests (test components from third party software and pieces of the CSS build system) are included as submodules. To obtain these components run the following in the root of your checkout:

git submodule update --init --recursive

Prior to commit 39d07eb01fab607ab1ffd092051cded1bdd64d78 submodules were required for basic functionality. If you are working with an older checkout, the above command is required in all cases.

When moving between a commit prior to 39d07eb and one after it git may complain

$ git checkout master
error: The following untracked working tree files would be overwritten by checkout:
[…]

...followed by a long list of files. To avoid this error, remove the resources and tools directories before switching branches:

$ rm -r resources/ tools/
$ git checkout master
Switched to branch 'master'
Your branch is up-to-date with 'origin/master'

When moving in the opposite direction, i.e. to a commit that does have submodules, you will need to git submodule update, as above. If git throws an error like:

fatal: No url found for submodule path 'resources/webidl2/test/widlproc' in .gitmodules
Failed to recurse into submodule path 'resources/webidl2'
fatal: No url found for submodule path 'tools/html5lib' in .gitmodules
Failed to recurse into submodule path 'resources'
Failed to recurse into submodule path 'tools'

...then remove the tools and resources directories, as above.

Windows Notes

On Windows wpt commands must be prefixed with python or the path to the python binary (if python is not in your %PATH%).

python wpt [command]

Alternatively, you may also use Bash on Ubuntu on Windows in the Windows 10 Anniversary Update build, then access your windows partition from there to launch wpt commands.

Please make sure git and your text editor do not automatically convert line endings, as it will cause lint errors. For git, please set git config core.autocrlf false in your working tree.

Certificates

By default pre-generated certificates for the web-platform.test domain are provided in tools/certs. If you wish to generate new certificates for any reason it's possible to use OpenSSL when starting the server, or starting a test run, by providing the --ssl-type=openssl argument to the wpt serve or wpt run commands.

If you installed OpenSSL in such a way that running openssl at a command line doesn't work, you also need to adjust the path to the OpenSSL binary. This can be done by adding a section to config.json like:

"ssl": {"openssl": {"binary": "/path/to/openssl"}}

On Windows using OpenSSL typically requires installing an OpenSSL distribution. Shining Light provide a convenient installer that is known to work, but requires a little extra setup, i.e.:

Run the installer for Win32_OpenSSL_v1.1.0b (30MB). During installation, change the default location for where to Copy OpenSSL Dlls from the System directory to the /bin directory.

After installation, ensure that the path to OpenSSL (typically, this will be C:\OpenSSL-Win32\bin) is in your %Path% Environment Variable. If you forget to do this part, you will most likely see a 'File Not Found' error when you start wptserve.

Finally, set the path value in the server configuration file to the default OpenSSL configuration file location. To do this create a file called config.json. Then add the OpenSSL configuration below, ensuring that the key ssl/openssl/base_conf_path has a value that is the path to the OpenSSL config file (typically this will be C:\\OpenSSL-Win32\\bin\\openssl.cfg):

{
  "ssl": {
    "type": "openssl",
    "encrypt_after_connect": false,
    "openssl": {
      "openssl_binary": "openssl",
      "base_path: "_certs",
      "force_regenerate": false,
      "base_conf_path": "C:\\OpenSSL-Win32\\bin\\openssl.cfg"
    },
  },
}

Trusting Root CA

To prevent browser SSL warnings when running HTTPS tests locally, the web-platform-tests Root CA file cacert.pem in tools/certs must be added as a trusted certificate in your OS/browser.

NOTE: The CA should not be installed in any browser profile used outside of tests, since it may be used to generate fake certificates. For browsers that use the OS certificate store, tests should therefore not be run manually outside a dedicated OS instance (e.g. a VM). To avoid this problem when running tests in Chrome or Firefox use wpt run, which disables certificate checks and therefore doesn't require the root CA to be trusted.

Publication

The master branch is automatically synced to http://w3c-test.org/.

Pull requests are automatically mirrored except those that modify sensitive resources (such as .py). The latter require someone with merge access to comment with "LGTM" or "w3c-test:mirror" to indicate the pull request has been checked.

Finding Things

Each top-level directory matches the shortname used by a standard, with some exceptions. (Typically the shortname is from the standard's corresponding GitHub repository.)

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 html/browsers/history/the-history-interface/.

Various resources that tests depend on are in common, images, and fonts.

Branches

In the vast majority of cases the only upstream branch that you should need to care about is master. If you see other branches in the repository, you can generally safely ignore them.

Contributing

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 topic.
  • Make your changes.
  • Run the lint script described below.
  • Commit locally and push that to your repo.
  • Send in a pull request based on the above.

Issues with web-platform-tests

If you spot an issue with a test and are not comfortable providing a pull request per above to fix it, please file a new issue. Thank you!

Lint tool

We have a lint tool for catching common mistakes in test files. You can run it manually by starting the lint executable from the root of your local web-platform-tests working directory like this:

./wpt lint

The lint tool is also run automatically for every submitted pull request, and reviewers will not merge branches with tests that have lint errors, so you must fix any errors the lint tool reports.

In the unusual case of error reports for things essential to a certain test or that for other exceptional reasons shouldn't prevent a merge of a test, update and commit the lint.whitelist file in the web-platform-tests root directory to suppress the error reports.

For more details, see the lint-tool documentation.

Adding command-line scripts ("tools" subdirs)

Sometimes you may want to add a script to the repository that's meant to be used from the command line, not from a browser (e.g., a script for generating test files). If you want to ensure (e.g., for security reasons) that such scripts won't be handled by the HTTP server, but will instead only be usable from the command line, then place them in either:

  • the tools subdir at the root of the repository, or

  • the tools subdir at the root of any top-level directory in the repository which contains the tests the script is meant to be used with

Any files in those tools directories won't be handled by the HTTP server; instead the server will return a 404 if a user navigates to the URL for a file within them.

If you want to add a script for use with a particular set of tests but there isn't yet any tools subdir at the root of a top-level directory in the repository containing those tests, you can create a tools subdir at the root of that top-level directory and place your scripts there.

For example, if you wanted to add a script for use with tests in the notifications directory, create the notifications/tools subdir and put your script there.

Test Review

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.

META.yml files are used only to indicate who should be notified of pull requests. If you are interested in receiving notifications of proposed changes to tests in a given directory, feel free to add yourself to the META.yml file. Anyone with expertise in the specification under test can approve a pull request. In particular, if a test change has already been adequately reviewed "upstream" in another repository, it can be pushed here without any further review by supplying a link to the upstream review.

Search filters to find things to review:

Getting Involved

If you wish to contribute actively, you're very welcome to join the public-test-infra@w3.org mailing list (low traffic) by signing up to our mailing list. The mailing list is archived.

Join us on irc #testing (irc.w3.org, port 6665). The channel is archived.

Documentation