How to prevent a media attribute from matching anything

I have a <picture> tag with <source srcset="..." media="(prefers-color-scheme: dark)"> inside.

In my Javascript code, I need to switch the media attribute between the following 3 states:

1. Only matching when the OS is in dark mode
2. Always matching
3. Never matching

I am currently achieving this by setting media="(prefers-color-scheme: dark)", media="" and media="match_nothing" for states 1, 2 and 3 respectively. I tried it, and it seemed to achieve the exact result I was looking for.

Other than by deleting the entire source element, is there a documented way of achieving this result, instead of using the improvised "match_nothing" attribute value?