Has dc ever collaborated with marvel on a superhero crossover?

DC and Marvel are distinct comic book companies that have maintained separate cinematic universes. To date, there has been no official film or television project that brings characters from the DC Universe and the Marvel Universe together. While fans have speculated about such a crossover, the only confirmed collaborations between DC and Marvel involve shared platforms or licensing agreements, not joint storytelling. Therefore, there is no evidence of a superhero crossover produced by either company.