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+Web-platform-tests are designed to run in a self-contained environment
+on the local computer. All the required resources are packaged with
+the web-platform-tests repository.
+
+## Requirements
+
+ * [git](http://git-scm.com/)
+ * [Python 2.7](http://python.org)
+ * [OpenSSL](https://www.openssl.org)
+
+## Hosts configuration
+
+The tests depend on certain domains being available. These are
+typically configured locally with `web-platform.test` as the top level
+domain and five subdomains. To configure these domains you need to edit
+your
+[`hosts` file](http://en.wikipedia.org/wiki/Hosts_%28file%29%23Location_in_the_file_system). 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
+0.0.0.0     nonexistent-origin.web-platform.test
+```
+
+## Cloning the Repository
+
+If you have not done so, clone the web-platform-tests repository:
+
+    git clone --recursive git@github.com:w3c/web-platform-tests.git
+
+If you have already made a clone, but did not specify `--recursive`
+update all submodules:
+
+    git submodule update --init --recursive
+
+## Font Files
+
+A number of tests rely upon a set of custom fonts, with
+[Ahem](https://github.com/w3c/csswg-test/raw/master/fonts/ahem/ahem.ttf)
+being required to be installed according to the normal font-install
+procedure for your operating system. Other tests which require other
+fonts explicitly state this and provide links to required fonts.
+
+## Running the Test Server
+
+The test environment can be started using
+
+    ./serve
+
+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, copy the
+`config.default.json` file to `config.json` and edit the new file,
+replacing the part that reads:
+
+```
+"http": [8000, "auto"]
+```
+
+to some port of your choice e.g.
+
+```
+"http": [1234, "auto"]
+```
+
+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"}}
+```
+
+### Windows Notes
+
+Running wptserve with SSL enabled on Windows typically requires
+installing an OpenSSL distribution.
+[Shining Light](https://slproweb.com/products/Win32OpenSSL.html)
+provide a convenient installer that is known to work, but requires a
+little extra setup.
+
+After installation ensure that the path to OpenSSL is on your `%Path%`
+environment variable.
+
+Then set the path to the default OpenSSL configuration file (usually
+something like `C:\OpenSSL-Win32\bin\openssl.cfg` in the server
+configuration. To do this copy `config.default.json` in the
+web-platform-tests root to `config.json`. Then edit the JSON so that
+the key `ssl/openssl/base_conf_path` has a value that is the path to
+the OpenSSL config file.