Following up on the meta thread, it appears that we not only have to upgrade the forum software, but also the spoiler plugin.
On our forum, Hanon wrote this:
The HTML for that looks like this:
<span class="spoiled spoiler-blurred" role="button" tabindex="0
data-spoiler-state="blurred" aria-expanded="false"
aria-label="Show hidden content">spoiler</span>
Whereas on meta.discourse.org, keegan posted this:
Testing this will be read
And the HTML for that looks like this:
<div class="spoiled spoiler-blurred" dir="ltr" role="button" tabindex="0"
data-spoiler-state="blurred" aria-expanded="false"
aria-label="Show hidden content" aria-live="polite">
<p aria-hidden="true">Testing this will be read</p>
</div>
We’re clearly not using the same code/version they’re using.