Punctuation

Q. I know the period or comma goes inside both single and double quotation marks, but is an apostrophe treated the same as a single quotation mark, or does it stay with its word? For example: “That ain’t nothin’,” Joe replied.

A. Yes, the apostrophe is part of the word. You’ve styled it correctly.

[This answer relies on the 17th edition of CMOS (2017) unless otherwise noted.]