10 ILCS 5/24C-10

Whenever a Direct Recording Electronic Voting System is used to automatically record and count the votes on ballots, the provisions of this Section shall apply. A voter shall cast a proper vote on a ballot by marking the designated area for the casting of a vote for any party or candidate or for or against any public question. For this purpose, a mark is an intentional selection of the designated area on the ballot by appropriate means and which is not otherwise an identifying mark.