This is the specification for the content-hint attribute. This optional hint permits MediaStreamTrack consumers such as PeerConnection or MediaRecorder to encode or process track media with methods more appropriate to the type of content that is being consumed.
In reference to https://github.com/w3ctag/design-reviews/issues/539
This would be consistent with the web platform and TAG guidelines:
https://w3ctag.github.io/design-principles/#casing-rules