I recently posted a question about The Invisible Man (2020), Why doesn't Cecilia think the police will be suspicious?
...wherein pretty much the entire post is a spoiler, so I put in a "Spoilers ahead" warning at the top of the question. Someone edited the question to remove the warning and instead use the Spoiler markup to hide the first sentence of the question.
However, I'm just wondering what the correct course of action is here - IMHO a bit of text at the top is better because even if someone ignores the hidden text, the following sentences are also spoilers! The only way to keep them "safe" is to hide almost the entire question!
...which I think would be annoying to read and look bad.
Wouldn't a "spoiler warning" at the top be better in this case, and people who didn't wish to have it spoiled could just stop reading?