[html-tests] HTML: Add constructor for BeforeUnloadEvent (#5650)

• From: Aryeh Gregor <web-platform-tests-notifications@w3.org>
• Date: Sun, 23 Apr 2017 17:30:19 GMT
• To: public-web-platform-tests-notifications@w3.org
• Message-Id: <<web-platform-tests_issue_5650@w3.org>>

For whatwg/html#2575.

View on GitHub: https://github.com/w3c/web-platform-tests/pull/5650

Received on Sunday, 23 April 2017 17:30:31 UTC