Missing tasks in parallel steps in Picture-in-Picture

[dontcallmedom-bot]

While crawling Picture-in-Picture, the following algorithms fire an event, or resolve or reject a Promise, within a step that runs in parallel without first queuing a task:

• The algorithm that starts with "The requestPictureInPicture() method, when invoked, MUST return a new promise promise and run the following steps in parallel:" resolves/rejects a promise directly in a step that runs in parallel
• The algorithm that starts with "The exitPictureInPicture() method, when invoked, MUST return a new promise promise and run the following steps in parallel:" resolves/rejects a promise directly in a step that runs in parallel

See Dealing with the event loop in the HTML specification for guidance on how to deal with algorithm sections that run in parallel.

_{Cc @dontcallmedom @tidoust}

_{This issue was detected and reported semi-automatically by Strudy based on data collected in webref.}