Import wpt@767dc2a4f049c761bd146d61de2ea860a895a624

third_party/WebKit/LayoutTests/external/wpt/README.md

 The Web Platform Tests Project [![IRC chat](https://goo.gl/6nCIks)](http://irc.w3.org/?channels=testing)
 ==============================
 
 The Web Platform Tests Project is a W3C-coordinated attempt to build a
 cross-browser testsuite for the Web-platform stack.  However, for mainly
 historic reasons, the CSS WG testsuite is in a separate repository,
 [csswg-test](https://github.com/w3c/csswg-test). 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
@@ skipping 21 matching lines @@
 ```
 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
 ```
 
+If you are behind a proxy, you also need to make sure the domains above are
+excluded from your proxy lookups.
+
 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
 
     ./serve
@@ skipping 215 matching lines @@
 [contributing]: https://github.com/w3c/web-platform-tests/blob/master/CONTRIBUTING.md
 [ircw3org]: https://www.w3.org/wiki/IRC
 [ircarchive]: http://krijnhoetmer.nl/irc-logs/testing/
 [mailarchive]: http://lists.w3.org/Archives/Public/public-test-infra/
 
 Documentation
 =============
 
 * [How to write and review tests](http://testthewebforward.org/docs/)
 * [Documentation for the wptserve server](http://wptserve.readthedocs.org/en/latest/)