Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+The web-platform-tests Project
+==============================
+
+[![Taskcluster CI Status](https://community-tc.services.mozilla.com/api/github/v1/repository/web-platform-tests/wpt/master/badge.svg)](https://community-tc.services.mozilla.com/api/github/v1/repository/web-platform-tests/wpt/master/latest) [![documentation](https://github.com/web-platform-tests/wpt/workflows/documentation/badge.svg)](https://github.com/web-platform-tests/wpt/actions?query=workflow%3Adocumentation+branch%3Amaster) [![manifest](https://github.com/web-platform-tests/wpt/workflows/manifest/badge.svg)](https://github.com/web-platform-tests/wpt/actions?query=workflow%3Amanifest+branch%3Amaster) [![Python 3](https://pyup.io/repos/github/web-platform-tests/wpt/python-3-shield.svg)](https://pyup.io/repos/github/web-platform-tests/wpt/)
+
+The web-platform-tests Project is a cross-browser test suite 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.
+
+The most important sources of information and activity are:
+
+- [github.com/web-platform-tests/wpt](https://github.com/web-platform-tests/wpt):
+  the canonical location of the project's source code revision history and the
+  discussion forum for changes to the code
+- [web-platform-tests.org](https://web-platform-tests.org): the documentation
+  website; details how to set up the project, how to write tests, how to give
+  and receive peer review, how to serve as an administrator, and more
+- [wpt.live](https://wpt.live): a public deployment of the test suite,
+  allowing anyone to run the tests by visiting from an
+  Internet-enabled browser of their choice
+- [wpt.fyi](https://wpt.fyi): an archive of test results collected from an
+  array of web browsers on a regular basis
+- [Real-time chat room](https://app.element.io/#/room/#wpt:matrix.org): the
+  `wpt:matrix.org` matrix channel; includes participants located
+  around the world, but busiest during the European working day.
+- [Mailing list](https://lists.w3.org/Archives/Public/public-test-infra/): a
+  public and low-traffic discussion list
+- [RFCs](https://github.com/web-platform-tests/rfcs): a repo for requesting
+  comments on substantial changes that would impact other stakeholders or
+  users; people who work on WPT infra are encouraged to watch the repo.
+
+**If you'd like clarification about anything**, don't hesitate to ask in the
+chat room or on the mailing list.
+
+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
+=================
+
+See the [documentation website](https://web-platform-tests.org/running-tests/)
+and in particular the
+[system setup for running tests locally](https://web-platform-tests.org/running-tests/from-local-system.html#system-setup).
+
+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.
+* `wpt serve-wave` - For starting the wpt http server and the WAVE test runner.
+For more details on how to use the WAVE test runner see the [documentation](./tools/wave/docs/usage/usage.md).
+
+<span id="windows-notes">Windows Notes</span>
+=============================================
+
+On Windows `wpt` commands must be prefixed with `python` or the path
+to the python binary (if `python` is not in your `%PATH%`).
+
+```bash
+python wpt [command]
+```
+
+Alternatively, you may also use
+[Bash on Ubuntu on Windows](https://msdn.microsoft.com/en-us/commandline/wsl/about)
+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.
+
+Publication
+===========
+
+The master branch is automatically synced to [wpt.live](https://wpt.live/) and
+[w3c-test.org](https://w3c-test.org/).
+
+Contributing
+============
+
+Save the Web, Write Some Tests!
+
+Absolutely everyone is welcome to contribute to test development. 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 `./wpt lint` as described above.
+* Commit locally and push that to your repo.
+* Create 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](https://github.com/web-platform-tests/wpt/issues/new).
+Thank you!