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    <p>It's unclear what programming language you're using or are preferring, but in Java there's <a href="http://jsoup.org/" rel="nofollow noreferrer">Jsoup</a>, which is a pretty slick HTML parser API which contains among others a HTML cleaner based on a customizable whitelist of HTML tags and attributes (unfortunately no CSS rules since that's completely out the scope of a HTML parser). Here's an extract of relevance from <a href="http://jsoup.org/cookbook/cleaning-html/whitelist-sanitizer" rel="nofollow noreferrer">its site</a>.</p> <blockquote> <h2><a href="http://jsoup.org/cookbook/cleaning-html/whitelist-sanitizer" rel="nofollow noreferrer">Sanitize untrusted HTML</a></h2> <h3>Problem</h3> <p>You want to allow untrusted users to supply HTML for output on your website (e.g. as comment submission). You need to clean this HTML to avoid <a href="http://en.wikipedia.org/wiki/Cross-site_scripting" rel="nofollow noreferrer">cross-site scripting</a> (XSS) attacks.</p> <h3>Solution</h3> <p>Use the jsoup HTML <a href="http://jsoup.org/apidocs/org/jsoup/safety/Cleaner.html" rel="nofollow noreferrer"><code>Cleaner</code></a> with a configuration specified by a <a href="http://jsoup.org/apidocs/org/jsoup/safety/Whitelist.html" rel="nofollow noreferrer"><code>Whitelist</code></a>.</p> <pre><code>String unsafe = "&lt;p&gt;&lt;a href='http://example.com/' onclick='stealCookies()'&gt;Link&lt;/a&gt;&lt;/p&gt;"; String safe = Jsoup.clean(unsafe, Whitelist.basic()); // now: &lt;p&gt;&lt;a href="http://example.com/" rel="nofollow"&gt;Link&lt;/a&gt;&lt;/p&gt; </code></pre> </blockquote> <p>The <a href="http://jsoup.org/apidocs/org/jsoup/safety/Whitelist.html" rel="nofollow noreferrer"><code>Whitelist</code></a> class itself contains several predefinied whitelists which may be of use, like <a href="http://jsoup.org/apidocs/org/jsoup/safety/Whitelist.html#basic%28%29" rel="nofollow noreferrer"><code>Whitelist#basic()</code></a> and <a href="http://jsoup.org/apidocs/org/jsoup/safety/Whitelist.html#relaxed%28%29" rel="nofollow noreferrer"><code>Whitelist#relaxed()</code></a>.</p> <p>For .NET, there's by the way a Jsoup port with the name <a href="http://nsoup.codeplex.com/" rel="nofollow noreferrer">NSoup</a></p>
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    1. POHow safe is it to accept a pre-defined set of non-harmful HTML tags from a request?
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    1. COThis NSoup thingy has made it very simple! Thanks for the link! :)
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    2. COInteresting fact: this port was triggered by [one of my Jsoup answers](http://stackoverflow.com/questions/2835505/how-to-scan-a-website-or-page-for-info-and-bring-it-into-my-program/2835555#2835555) :) (check the comments)
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    3. COvery nice :) The only thing I miss from it is the cleanup of CSS rules. (Or is it there? I couldn't found it.)
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