Neither is actually proper. The rule is to avoid using them at all. It's been a while, but if they changed the rule it's one I didn't know about. My education, which was quite good, taught I'd: I had. I'ld: I would.You are wrong. I'd only got in the mix since word processors. The proper contraction is and always has been "I'ld". I'd is "I had", as in I'd better go", I would is I'ld, as in "I'ld have gone". At any rate as a contraction it's more of a colloquialism than acceptable written English. Properly it should be avoided, so if you're going to complain about grammar... don't use it.
False, I'd is a doubly used contraction keyed by its context. I'ld is no longer proper and is no longer accepted. Go to school, check it out.
Enough of it. I still hate grammar nazi's on message boards.
Speech Nazis are ok, though.