How to apply kerning to a header?

How could I apply ‘kerning’ to a header with Source?
I tried using a class
.kern { font-feature-settings: "kern"; font-kerning: normal; }
and of course the alternatives: h1 and kern > h1
But I cannot get it to work. The font does support kerning in TTF, so WOFF2 should be good to, right?
(ChatGPT was a lousy help btw 😂 )

Silly me… kerning is on by default. That became obvious when I set font-kerning: none;
duh! 🙄