I didn't know it's part of the SQL-standard, thought it was something postgres-specific.
MySQL doesn't support it ... https://dev.mysql.com/doc/refman/8.0/en/ansi-diff-select-into-table.html ... but according to the docs, mariadb supports it by now. Haven't tested it though.
Yes, some SQL languages support it, some don't. Most SQL languages have something similar and they work in a similar way where some of the schema is copied, while some is not (like defaults). In this example, I use a specific SQL platform, SQL Server, to demonstrate this, but it would vary by SQL tool.