A spoiler is a piece of information that reveals specific plot points about a narrative work. Having a spoiler revealed before experiencing the work in full may degrade the experience.
Over the years, Acepedia has adopted a loose, unofficial spoiler policy. Users would mark spoilers at their own discretion related to newer games (mostly Ace Combat: Assault Horizon and Ace Combat Infinity), while leaving spoilers related to older games unmarked.
What to Mark
Starting on July 17, 2019, all content related to "Liberated" and the other two DLC missions for Ace Combat 7: Skies Unknown must be marked as spoilers. This will expire three months after the last DLC mission release.
Everything else on the wiki must remain unmarked. This covers all information from every game before Ace Combat 7, as well as the main (non-DLC) story of Ace Combat 7.
How to Mark
To mark an entire article as containing spoilers, use Template:Spoiler at the top of the page. On desktop, this will show a large message box similar to stub or cleanup templates at the top of the article. On mobile, this will show a large text warning below the infobox. Attempt to avoid spoilers as much as feasibly possible in the introduction area. This includes any quote templates, hatnotes, or infoboxes.
To mark portions of an article or section as containing spoilers, use Template:SpoilerBlocks and wrap the relevant material inside of
<span class="spoiler"></span> code blocks. No other guidelines are necessary, since users must take action to see these spoilers on desktop. Similar to Template:Spoiler, Template:SpoilerBlocks will generate a message box on desktop or a large text warning on mobile.