A coordinated push to replicate California’s first-in-the-nation youth digital privacy law is encountering fierce opposition from the tech industry, which has made stopping bills in other states a top priority.

A landmark California bill aimed at promoting children’s digital welfare became law on Thursday, as Gov. Gavin Newsom announced he had signed the legislation imposing strict requirements on websites “likely to be accessed” by kids.

California will adopt a broad new approach to protecting children online after Gov. Gavin Newsom signed a bill on Thursday that could transform how many social networks, games and other services treat minors.

California, home to some of the world’s largest tech companies, passed a landmark bill on Tuesday that would require a broad swathe of apps and sites to strengthen their safety protections for young users.

California’s state legislature passed a bill this week that, if enacted, would require online platforms to take extra measures to ensure their services are safe for young users.