Re: [web-animations-tests] Implement shadow list addition. (#4494)

Notifying @birtles. *([Learn how reviewing works](https://github.com/w3c/web-platform-tests/blob/master/README.md#test-review).)*

View on GitHub: https://github.com/w3c/web-platform-tests/pull/4494#issuecomment-270149672

Received on Tuesday, 3 January 2017 16:06:35 UTC