It can be usefull if the web viewer detect system dark or light mode like browsers' css media : @media (prefers-color-scheme: dark) {}

Hi.
Try using Javascript as this is the correct function for any modern browser (HTML5):

window.matchMedia('(prefers-color-scheme: dark)').matches

Source and Example: https://flaviocopes.com/javascript-detect-dark-mode/

DevWithCoffee Thanks for the explanation, I'll try to do it here! Thank you even now I understand the flaws.