WPT details: There are no WPTs for the moment. It seems like WPTs are where the discussion to add this to the HTML standard fell off. A WPT could be written using a WebAudio pitch detector, such as: https://github.com/cwilso/pitchdetect
Adds a property to determine whether the pitch of an audio or video element should be preserved when adjusting the playback rate.
This feature is needed for creative purposes (e.g. pitch-shifting "DJ deck" style applications), and is already supported by Safari and Firefox. It can also allow prevent the introduction of artifacts from pitch-preserving algorithms at playback speeds very close to 1.00.