Clipboard API and events

2016-03-02: ACTION-2016 Michiel to review.
2016-03-09: 9 March 2016 APA meeting Michiel thinks it should specify focus impacts when the API is used.
2016-03-30: Issue filed.
2016-04-06: APA discussion 6 April 2016. Michiel to file an issue within HTML to address the issue.
2016-04-06: issue filed against HTML specification.
2020-11-04: ACTION-2265 Becky to re-review.