I'm using a counter for my titles but would like to skip some of them. I can override the adding of the number but not the incrementation of the counter :

h1 {
    break-before: page;
    counter-reset: h2;
    counter-increment: h1;
}

h1.not-numbered {
    counter-increment: none; /* the following title will still be 2 instead of just 1*/
    break-before: none;   /* override the break-before: page*/
}