I was pointing out the dangers of user-permitted HTML markup many years ago
when I talked about how I was including Barney the Dinosaur into guestbooks
on my home page.
I don't think there's a completely secure solution. tilly wrote a fairly
nice strongbox solution that permits very carefully a subset of HTML,
but it's more in the "only permitted things allowed" realm than the "look
for bad things and prevent them" realm. Given the risk, I'd say this is the right
-- Randal L. Schwartz, Perl hacker
Thanks to mdillon
for the link for tilly's node.
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
Want more info? How to link
or How to display code and escape characters
are good places to start.