[UX] Identifying new Interaction - Arrow down to mute

In India, you can only watch on Reliance’s JioCinema. When you watch any new video/live stream on the website (fullscreen or otherwise) and press the Down arrow on the keyboard, It mutes the video. If you press the Up arrow, it increases the volume by one level. This is the first time I have seen an interaction like this, which is subtle but a differentiator.