Cal. Elections Code § 2408

(a) A voter registration agency that allows a person to apply online for service or assistance, or to submit a recertification, renewal, or change of address form relating to the service or assistance online, shall implement a process and infrastructure that allows an applicant to electronically submit a voter preference form to the voter registration agency, and to submit an affidavit of voter registration electronically on the Internet Web site of the Secretary of State in accordance with Chapter 2.5 (commencing with Section 2196). (b) If a person indicates on his or her electronic voter preference form that he or she would like to register to vote, the person shall be informed that he or she may register to vote through one of the following options, if applicable: (1) Submit an affidavit of voter registration electronically on the Secretary of State’s Internet Web site pursuant to subdivision (a) of Section 2196. (2) Complete an affidavit of voter registration electronically on the Secretary of State’s Internet Web site, print a hard copy of the completed affidavit, and mail or deliver the hard copy of the completed affidavit to the Secretary of State or the appropriate county elections official pursuant to subdivision (d) of Section 2196. (c) A voter registration agency may take steps to ensure that the information entered into a person’s electronic application for service or assistance, or his or her electronic recertification, renewal, or change of address form relating to the service or assistance, will be automatically transferred to the electronic affidavit of voter registration if the person indicates that he or she would like to register to vote. (d) The Secretary of State shall take steps to ensure that the electronic affidavit of voter registration is available, and may be electronically submitted and verified, in all languages in which a county is required to provide voting materials pursuant to Section 203 (52 U.S.C. Sec. 10503) or Section 4(f)(4) (52 U.S.C. Sec. 10303(f)(4)) of the federal Voting Rights Act of 1965.