show danmaku in picture-in-picture

[xenochrox]

when play videos with danmaku,like videos on bilibili,firefox can't show danmaku in PIP window.acutally there is a plugin on Chrome and Edge that uses the documentPictureInPicture API to make this work, i know it is not a W3C Standard nor is it on the W3C Standards Track,but i want to know is it possible to find another way to achieve this function

i post the plugin's link here, i hope you don't mind

https://github.com/apades/dmMiniPlayer 

[Jon]

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[RAV]

I don't know if it's solely danmaku, or subtitles/captioning in general.