This is what the Senedd site says
Wales will be divided into 16 areas for the 2026 election, called constituencies.
Each constituency will have six seats in the Senedd, which means six Members will be elected in each area.
Political parties will list up to eight candidates for each constituency. Independent candidates can also stand for election.
You will vote for one party or one independent candidate.
The seats are allocated based on the share of votes each party or independent candidate gets.
For example, if a party wins three seats, the top three people on their list will be elected to those seats.
96 Members of the Senedd will be elected in total.