Fix union linking the elements not the roots — find the bug

const owner = [0, 1, 2];
function find(x) { while (owner[x] !== x) x = owner[x]; return x; }
function union(a, b) { owner[a] = b; }
union(0, 1); union(0, 2);
document.querySelector('#out').textContent = find(1) === find(2) ? "connected" : "separate";