<p></p>
<p>I wasn't aware of this particular error, but I've wrestled with html in our flash messages before and it's a bit of a nightmare.</p>
<p>Rails flash <a href="https://api.rubyonrails.org/classes/ActionDispatch/Flash.html" rel="nofollow">only allows</a> <code>String</code>, <code>Array</code> and <code>Hash</code> as flash objects, notably not <code>SafeBuffer</code>. So if we output the raw string (via <code>raw</code> or marking it as <code>.html_safe</code>) then we get problems like <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="99646015" data-permission-text="Title is private" data-url="https://github.com/openstreetmap/openstreetmap-website/issues/1027" data-hovercard-type="issue" data-hovercard-url="/openstreetmap/openstreetmap-website/issues/1027/hovercard" href="https://github.com/openstreetmap/openstreetmap-website/issues/1027">#1027</a> . If we let rails escape the <code>String</code>, then we get problems like this issue.</p>
<p>I'm not sure what the best approach is, so any suggestions are welcome.</p>

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