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An answer today caught my attention: https://math.stackexchange.com/a/2185406/62967

Here's an image of what I see with Safari 10.0.3 (with Firefox 52.0 it's the same):

enter image description here

The link in the spoiler is not hidden. Here's the picture taken with the pointer hovering over the spoiler

enter image description here

Here's the relevant part of the source:

Can you explicitly write up the congruences?

>! See also [monogenic semigroups][1].

  [1]: https://en.wikipedia.org/wiki/Monogenic_semigroup

A spoiler with a link follows. Can you see it?

Spoiler with link

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  • $\begingroup$ Possibly related $\endgroup$ Mar 13 '17 at 22:02
  • $\begingroup$ @DanielFischer Well, one can avoid using \color, but links are not under user's control. Anyway this is not related to MathJax. Not a big deal, but a bit annoying. $\endgroup$
    – egreg
    Mar 13 '17 at 22:05
  • $\begingroup$ Yes. I'm just saying it might be the same (or a related) mechanism causing both. $\endgroup$ Mar 13 '17 at 22:09
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    $\begingroup$ This seems to be specific to this site, and I think is a genuine bug that is something to be fixed. It does not happen on Mathematics Educators (precisely its meta), while it does happen also on meta here. Further there is a Meta Stack Exchange post about visited links showing through spoilers, which was declared fixed meta.stackexchange.com/questions/256941/… $\endgroup$
    – quid Mod
    Mar 13 '17 at 23:18
  • $\begingroup$ @quid Thanks for the investigation; I left a comment to the meta.stackexchange answer. That question seems to address a different problem related to visited links. I did not visit the link in this spoiler. $\endgroup$
    – egreg
    Mar 13 '17 at 23:23
  • $\begingroup$ Yes. What I meant to convey with the meta.se link is to say that this type of problem seems to be something that gets fixed (as it did get fixed even in the more restrained scenario of an already visited link). While the MJ color thing got declared as 'by design'. $\endgroup$
    – quid Mod
    Mar 13 '17 at 23:26
  • $\begingroup$ It seems the problem went away! At least for me. See the answer here and on main. $\endgroup$
    – quid Mod
    Mar 13 '17 at 23:54
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    $\begingroup$ @quid I added a spoiler with an unvisited link (invalid, actually). It shows on my machine. A visited one is hidden, instead. $\endgroup$
    – egreg
    Mar 14 '17 at 0:12
  • $\begingroup$ Thank you for tracking this down. It is actually the same here. I was mislead byvisiting the link, then doing something else, and then noticing the link being properly hidden and not making that connection. The info that it does not happen on MESE seems correct though. I double checked and a spoiler there hides visited and unvisited alike. $\endgroup$
    – quid Mod
    Mar 14 '17 at 0:44
  • $\begingroup$ I see the same visible unvisited link in hidden text with Google Chrome 57. $\endgroup$
    – hardmath
    Mar 14 '17 at 1:26
  • $\begingroup$ One of my most upvoted comments is about a floating link inside of a spoiler box. (Found with this SEDE query) $\endgroup$
    – pjs36
    Mar 14 '17 at 2:25
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I've gone an updated the CSS for spoilers - there was something overriding the spoiler CSS in this instance.

With you in the next build (rev. 2017.3.14.*)

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  • $\begingroup$ Thanks, I'll mark it as accepted when the links will disappear. ;-) $\endgroup$
    – egreg
    Mar 14 '17 at 13:05
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    $\begingroup$ You should have put this inside a spoiler tag, with a link to your own answer. :( $\endgroup$
    – Asaf Karagila Mod
    Mar 14 '17 at 16:28
  • $\begingroup$ @egreg: I advise you to hold off acceptance until Oded complies with my comment. But otherwise, the new version has been pushed. $\endgroup$
    – Asaf Karagila Mod
    Mar 14 '17 at 18:14
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    $\begingroup$ A minor issue is still present: if I hover on the spoiler and click the link, the spoiler doesn't disappear when the pointer exits the area. Apart from this, visited and unvisited links behave as expected. $\endgroup$
    – egreg
    Mar 14 '17 at 18:40

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