User blog comment:HiccstridFan92/Handling Spoilers for the Third Film/@comment-32497031-20180528090622/@comment-34320391-20180528105926

I agree.

I'd think that the Spoiler Tab would be kept for a month after HTTYD: HW's release in an ideal situation, but it does require more difficult coding, which may restrict some users in certain situations...

I suggest enforcing the above spoilers tabs, and warning users not to go to HTTYD: HW spoiler-sensitive pages until watching the movie... A perfect spoiler-free system is nearly impossible to perfect, but your above plan is probably the most effective resolution to get close.