Is `Delete From Join` Standard SQL?

Question

Among other questions, this one asked how to delete from a join.

My question: How much of this is standard SQL? On which databases would this actually work (most not

Answer 1

DELETE ... FROM .. Is not part of the ANSI standards, nor UPDATE ... FROM ... for that matter. This includes any join syntax, since the join can only be specified with a FROM.

All vendors implement this though in one form or another.