goldfish21 wrote:
Aaah. When I googled the results showed spoiler tags, not “spoil.”
Extension tags can be defined and created pretty much as the phpBB implementer decides, which can unfortunately introduce rogue tags specific to one installation. This can cause problems where the specificity isn't noted in the explanations Google finds - possibly because the poster of that information wasn't aware that [spoil
er] was an extension.
AFAIK the out-the-box phpBB spoiler tag pair is spoil /spoil.