Hallo RW,
danke, so funktioniert es:
var arr_playlists = document.querySelectorAll(".playlist");
for ( let i=0; i < arr_playlists.length; i++ ) {
let arr_li = arr_playlists[i].querySelectorAll("li");
for ( let j=0; j < arr_li.length; j++ ) {
arr_playlists[i][j] = arr_li[j];
}
}
console.log( "Titel 1,1=[" +arr_playlists[1][1].innerHTML +"]" );