For everyone who doesn't want to mark the entire post as the spoiler and can be bothered to tinker with html, I found a simple code here:
(Click on "view source" icon to the right to get the clear html popup.)
Not ideal, but it will serve for now. If you use multiple ones, be sure to give them ID. (Where it says "spoiler" or 'spoiler', just add something, like make it "spoiler01"/'spoiler01'.)
If I find a better one, I'll let you know.
I also want to apologise to anyone following me in case my imported reviews from GR pop up on their dashboard; I don't have time to fix them as they come up. Please bear with me for a little while.