From stackoverflow
In this table, _ means space character. \n means "newline character" (\n in JavaScript), except for the "in-line newlines" row, where it means literally a backslash and an n).
> | " ' >- >+ |- |+
-------------------------|------|-----|-----|-----|------|------|------|------
Trailing spaces | Kept | Kept | | | | Kept | Kept | Kept | Kept
Single newline => | _ | \n | _ | _ | _ | _ | _ | \n | \n
Double newline => | \n | \n\n | \n | \n | \n | \n | \n | \n\n | \n\n
Final newline => | \n | \n | | | | | \n | | \n
Final dbl nl's => | | | | | | | Kept | | Kept
In-line newlines | No | No | No | \n | No | No | No | No | No
Spaceless newlines| No | No | No | \ | No | No | No | No | No
Single quote | ' | ' | ' | ' | '' | ' | ' | ' | '
Double quote | " | " | " | \" | " | " | " | " | "
Backslash | \ | \ | \ | \\ | \ | \ | \ | \ | \
" #", ": " | Ok | Ok | No | Ok | Ok | Ok | Ok | Ok | Ok
Can start on same | No | No | Yes | Yes | Yes | No | No | No | No
line as key |