[Autoplay] CFC: Issues #3, #6, and #7 - sync vs. async

This is a Call-for-Consensus for the proposed resolution of issues #3, #6, and #7 in the Autoplay API, to be discussed in a new GitHub Issue #11 <https://github.com/w3c/autoplay/issues/11 <https://github.com/w3c/autoplay/issues/11>>.

Please review the CfC at the GitHub issue above and provide feedback by end-of-your-day Friday October 18.

Thank you,

@jernoble