I’ve started using the “@ username” in-line trick to reply to multiples when not quoting. It does notify people that you’ve responded, and it definitely saves on posting.
Spoiler tags look like this.
Found out from @WearySky (on the Marvel topic) that spoiler tags can be done using [spoiler] plus the accompanying closing tag. (Note: this tag does not require a closing tag so, if providing multiple spoilers, you have to close each tag or all text within will blur.)
Safari does provide spellcheck. 
EDIT: removed quote information as it was posted above.
