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I added a system message according to the template Grace Note provided, the source code of the message is the following

There will be a short network-wide outage starting on 8/6 19:00 UTC for <a href="http://blog.serverfault.com/post/stack-exchange-maintenance-this-saturday/">system maintenance</a>. <span style="color:red; font-weight:bold;">Do not panic.</span>

The red "Do not panic" is rendered red in the preview, but not on the actual live system message. It appears without any formatting. I could understand if the formatting for those message would be limited, but the preview should ideally reflect the restrictions that will be imposed on the live system message.

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"Do not panic" does show up in the system message on Gaming. –  Anna Lear Aug 5 '11 at 20:30
    
@Anna but not in red (and badp modified the template, AFAIK). I'll clarify my question. –  Mad Scientist Aug 5 '11 at 20:33
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+1 On Science Fiction & Fantasy, “do not panic” is supposed to be written in large, friendly letters. What's large and friendly about the normal font? –  Gilles Aug 5 '11 at 20:39
    
It doesn't show up at all on Software Quality Assurance & Testing... strange. –  corsiKa Aug 5 '11 at 20:57
    
@glowcoder: because you haven't put it there yet... –  Shog9 Aug 5 '11 at 21:01
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@Shog ah, I figured it was a system wide announcement sheepish look –  corsiKa Aug 5 '11 at 21:04
    
@glowcoder: yeah, it isn't; not sure why not. But it not being is sorta the instigator of this request. –  Shog9 Aug 5 '11 at 21:11
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On the bright side, it made me go and find where in the control panel it is (which isn't in an intuitive place really. Not that I can think of a better place for it.) –  corsiKa Aug 5 '11 at 21:13
    
@glow Just don't forget to remove the message after the downtime is done. Whenever that is. –  Shog9 Aug 5 '11 at 23:27

2 Answers 2

up vote 4 down vote accepted

The HTML sanitizer exists as a JavaScript version anyway (for the editor preview), so I just hooked it up to the system message preview as well.

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We don't allow arbitrary HTML in system messages; it's subject to the same HTML whitelist that every other post on the entire Stack Exchange network is subject to.

What HTML tags are allowed on Stack Exchange sites?

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From the question it sounds like the HTML sanitizer just isn't hooked up to that preview though, isn't that fixable? –  Tim Stone Aug 5 '11 at 22:55
    
Then why is it working on some sites? –  John Aug 6 '11 at 1:01

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