On Beta Stack Exchange sites, spoilered text is visible when it shouldn't be, when
- the text is
- the text is part of a hyperlink,
- and the hyperlink is visited
>! blah blah blah [You've probably visited this link; `This text should be invisible!` foobar](https://meta.stackoverflow.com/) blah
blah blah blah You've probably visited this link;
This text should be invisible!foobar blah
I noticed this after submitting my answer https://codegolf.stackexchange.com/a/6767/2276.
Similar to https://meta.stackexchange.com/questions/98358/when-editing-an-answer-with-spoilers-the-links-are-not-hidden-in-the-markdown-p, but in this case the actual post is affected, not just the preview.
I think this issue is in the CSS for the Beta Stack Exchange sites (incl. their metas), because I tried it on Japanese Meta and saw the same problem.