What are the elements of a cause of action for promissory estoppel?

Mata contends that he did allege all of the elements of a cause of action for promissory estoppel. He lists the elements of a cause of action for breach of contract; however, he never lists the elements of a cause of action for promissory estoppel. A fortiori, he does not explain how his allegations satisfied those elements. We therefore deem this argument forfeited. (Carr v. Rosien (2015) 238 Cal.App.4th 845, 856, fn. 6 [appellant forfeited contention "by failing to support it with reasoned argument and citation of authority."].)

This is not to say that, if not forfeited, it would have merit.