What type of issue is this?

Missing compatibility data

What information was incorrect, unhelpful, or incomplete?

Currently, HTMLMediaElement#playbackRate is listed as "Limited availability" despite universal browser support since 2015, because most browsers don't currently allow setting a negative value (i.e. specifying that the media should be played backwards). However, playing backwards seems like a fairly niche use case, versus the much more common use case of setting the speed.

What browsers does this problem apply to, if applicable?

Chromium (Chrome, Edge 79+, Opera, Samsung Internet), Legacy Edge (12-18), Firefox

What did you expect to see?

Probably should be baseline widely available, with a secondary entry in the support table for setting negative values.

Did you test this? If so, how?

N/A

Can you link to any release notes, bugs, pull requests, or MDN pages related to this?

No response

Do you have anything more you want to share?

No response

MDN URL

https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement/playbackRate

MDN metadata