Setup automatic generation of SVN logs with just one attribute, no link element neces...
[htmlpurifier-web.git] / index.xhtml
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1 <?xml version="1.0" encoding="UTF-8"?>
2 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
3 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
4 <html xmlns="http://www.w3.org/1999/xhtml"
5 xmlns:xi="http://www.w3.org/2001/XInclude"
6 xmlns:xc="urn:xhtml-compiler"
7 xmlns:rss="urn:xhtml-compiler:RSSGenerator"
8 xmlns:svn="urn:xhtml-compiler:Subversion"
9 svn:head-url="$HeadURL$"
10 svn:revision="$Revision$"
11 xc:rss-from-svn="yes"
12 xml:lang="en" lang="en">
13 <head>
14 <title>HTML Purifier - Filter your HTML the standards-compliant way!</title>
15 <xi:include href="common-meta.xml" xpointer="xpointer(/*/node())" />
16 <link rel="stylesheet" href="index.css" type="text/css" />
17 <meta name="description"
18 content="HTML filter that guards against XSS and ensures standards-compliant output." />
19 <meta name="keywords"
20 content="HTMLPurifier, HTML Purifier, HTML, filter, filtering, standards, compliant, w3c, XSS, PHP, security, library, open source, LGPL, whitelist" />
21 <link rel="alternate" type="application/rss+xml"
22 title="News - HTML Purifier" href="news.rss"
23 rss:for="news-container"
24 rss:description="Recent news and updates on HTML Purifier" />
25 </head>
26 <body>
28 <img src="logo.png" id="logo" alt="HTML Purifier" />
29 <h1 id="header"><span class="html">HTML</span>
30 <span class="purifier">Purifier</span></h1>
32 <div id="navigation">
33 <h2>Navigation</h2>
34 <ol>
35 <li><a href="#News">News</a></li>
36 <li><a href="#Plugins">Plugins</a></li>
37 <li><a href="#Demo">Demo</a></li>
38 <li><strong><a href="#Download">Download</a></strong></li>
39 <li><a href="#Resources">Resources</a></li>
40 <li><a href="phorum/">Forum</a></li>
41 <li><a href="#Contact">Contact</a></li>
42 </ol>
43 </div>
45 <div id="content">
47 <a href="#Download"><img src="download.png" class="download-button" alt="Download HTML Purifier" /></a>
49 <p><strong>HTML Purifier</strong> is a standards-compliant
50 <abbr>HTML</abbr> filter library written in
51 <abbr>PHP</abbr>. HTML Purifier will not only remove all malicious
52 code (better known as <abbr>XSS</abbr>) with a thoroughly audited,
53 secure <em>yet</em> permissive <strong><a
54 href="http://hp.jpsband.org/live/smoketests/printDefinition.php">whitelist</a></strong>,
55 it will also make sure your documents are
56 <strong>standards compliant</strong>, something only achievable with a
57 comprehensive knowledge of <abbr>W3C</abbr>'s specifications.
58 Tired of using BBCode due to the current landscape of deficient or
59 insecure <abbr>HTML</abbr> filters? Have a
60 <strong><acronym>WYSIWYG</acronym></strong> editor but never been able to use it? Looking
61 for high-quality, standards-compliant, open-source components for that
62 application you're building? HTML Purifier is for you!</p>
64 <blockquote class="fancy">
65 <div class="quote">
66 I'd just like to say we use HTML Purifier in <a href="http://www.iris.ac/">IRIS</a> for
67 filtering emails against XSS attacks and we've been more than impressed.
68 </div>
69 <div class="origin">&mdash; Chris Corbyn, <em>Senior IRIS Developer</em></div>
70 </blockquote>
72 <h2 id="Background">Background</h2>
74 <p>There are a number of open-source <abbr>HTML</abbr> filtering solutions out
75 there on the web already
76 (i.e. <acronym>PEAR</acronym>'s
77 <a href="http://pear.php.net/package/HTML_Safe">HTML_Safe</a>,
78 <a href="http://sourceforge.net/projects/kses">kses</a>
79 and
80 <a href="http://simon.incutio.com/archive/2003/02/23/safeHtmlChecker">
81 SafeHtmlChecker.class.php</a>). What sets HTML Purifier apart from them?
82 Aren't all of these choices <q>secure</q>?</p>
84 <p>When it comes to <abbr>HTML</abbr>, <strong>attention to
85 detail</strong> is key. Does the library demonstrate an in-depth
86 knowledge of the <abbr>DTD</abbr> that defines
87 <abbr>HTML</abbr>? Does it perform its filtering off a robust
88 whitelist rather than a usually out-dated blacklist? Does it go through
89 the care to check every single attribute in the document for validity?
90 Does it actually understand tag markup, or pay lip-service with a series
91 of deficient regexes and str_replace's?</p>
93 <p>Somewhere along the way, all of HTML Purifier's predecessors fall
94 flat. HTML_Safe dooms itself to attacks of the future by using a
95 blacklist. Configurable filters like kses and PHP Input Filter still
96 cannot validate the contents inside attributes. With all these gaps in
97 coverage, none of the usual libraries come close to achieving
98 <strong>standards-compliance</strong>. There is a user-unfriendly,
99 draconic <abbr>XML</abbr>-based filter called Safe HTML Checker,
100 but even it forgets that <code>&lt;a&gt;</code> tags cannot be nested
101 within each other!</p>
103 <p><strong>Know thy enemy.</strong> Wily hackers have a huge arsenal of
104 <abbr>XSS</abbr> hidden within the depths of the
105 <abbr>HTML</abbr> specification. HTML Purifier takes its
106 effectiveness from the fact that it will decompose the whole document
107 into tokens, and rigorously process the tokens by removing
108 non-whitelisted elements, transforming bad practice tags like font into
109 span, properly checking the nesting of tags and their children and
110 validating all attributes according to their <abbr>RFC</abbr>s.
111 HTML Purifier's comprehensive algorithms are complemented by a
112 <strong>breadth of knowledge</strong>, ensuring that richly formatted
113 documents pass through unstripped.</p>
115 <p><a href="comparison.html"><img src="compare.png" class="compare-button" alt="Compare HTML Purifier with other filters" /></a></p>
117 <p>To my knowledge, there is nothing else in the wild that offers
118 protection from <abbr>XSS</abbr>, standards-compliance, and the
119 corrective processing of poorly formed <abbr>HTML</abbr>
120 simultaneously. Don't take my word for it though:
121 do your research. Investigate the other libraries, and decide for
122 yourself who you would prefer to be the <strong>gatekeeper</strong> to
123 your system.</p>
125 <p>To find out more, you can read the
126 <a href="comparison.html"><strong>Comparison</strong></a>
127 for a play-by-play analysis of the major filter libraries currently
128 out there.</p>
130 <blockquote class="fancy">
131 <div class="quote">
132 [Y]ou save my day by allowing me not to write another damned HTML parser.
133 </div>
134 <div class="origin">
135 &mdash; Joseph Halter, <em>Technical Director at Akira Web</em>
136 </div>
137 </blockquote>
140 <h2 id="News">News</h2>
142 <div id="news-container" class="news">
144 <div class="item" id="news-1.6.0-released">
145 <h3 class="title">HTML Purifier 1.6.0 released</h3>
146 <div class="date">Sun, 01 April 2007 23:40:59 EDT</div>
148 <div class="body">
149 <p>Sorry, no April Fool's joke this year. To compensate, we have
150 the 1.6.0 <q>Long Overdue</q> release. This version contains support
151 for a number of deprecated attributes HTML Purifier should have
152 had from the very beginning, including the name, bgcolor, border,
153 width and height attributes. The <abbr>CSS</abbr> property 'height',
154 rel and rev attributes and ID blacklist regexps are also available.
155 In addition, HTML Purifier will give a friendly error message
156 when you try to enable an element or attribute that doesn't exist.</p>
158 <p>All in all, this is a fairly compact release, but it does
159 address some common requests brought up in the Forums, so I suggest
160 you upgrade anyway. You can check <a
161 href="http://hp.jpsband.org/svnroot/htmlpurifier/tags/1.6.0/NEWS">News</a>
162 for a complete changelog, but there's not much else.</p>
163 </div>
164 </div>
166 <div class="item" id="news-keep-me-updated">
167 <h3 class="title">A note to you distributors</h3>
168 <div class="date">Wed, 28 March 2007 21:05:12 EDT</div>
170 <div class="body">
171 <p>Yes, <strong>TikiWiki</strong> and <strong>PHProjekt</strong>,
172 I'm looking at you. I am absolutely delighted that these two fairly
173 popular and robust open-source projects are using my library.
174 However, I am not at all pleased at the fact that you have not
175 been keeping up to date with HTML Purifier releases.</p>
176 <ul>
177 <li>TikiWiki: <a href="http://tikiwiki.cvs.sourceforge.net/tikiwiki/tiki/lib/HTMLPurifier.php?view=log">1.3.0</a></li>
178 <li>PHProjekt: <a href="http://thinkforge.org/plugins/scmcvs/cvsweb.php/phprojekt50/lib/html/library/HTMLPurifier.php?cvsroot=phprojekt5">1.3.2</a></li>
179 </ul>
180 <p>I entreat yea, please sign up for the announcement list and
181 keep my library up-to-date! It's not difficult, I keep backwards
182 compatibility, and it makes your users happy! Especially that
183 <acronym>DOM</acronym> <abbr>XML</abbr> bug, which seems was
184 far more serious than I originally thought it was. That is all.</p>
185 </div>
186 </div>
188 <div class="item" id="news-pear-channel">
189 <h3 class="title"><acronym>PEAR</acronym> channel available</h3>
190 <div class="date">Sat, 24 March 2007 20:27:42 EDT</div>
192 <div class="body">
193 <p>At the prompting of Lars Olesen, HTML Purifier now
194 has its very own <acronym>PEAR</acronym> channel. This means that
195 installing HTML Purifier is as simple as:</p>
196 <pre class="command">pear channel-discover hp.jpsband.org
197 pear install hp/HTMLPurifier</pre>
198 </div>
199 </div>
201 <div class="item" id="news-1.5.0-released">
202 <h3 class="title">HTML Purifier 1.5.0 released</h3>
203 <div class="date">Fri, 23 March 2007 22:42:12 EDT</div>
205 <div class="body">
206 <p>The 1.5.0 major bugfix
207 release is available today. There have been some major internal
208 refactoring efforts, but these changes are invisible to you.</p>
210 <p>Entrepid souls wanting to test out the new
211 <code>HTMLModuleManager</code> class can check out the
212 <code>HTMLModule</code>s. Also, I will personally assist anyone
213 who has modified <code>HTMLDefinition.php</code>. <strong>If you
214 have patched any files, please consult the Support forums before
215 upgrading.</strong></p>
217 <p>And now, the goodies:</p>
219 <ul>
220 <li><strong><abbr>XHTML</abbr> 1.1-style modularization of
221 <code>HTMLDefinition</code>.</strong> Instead of one monster,
222 huge <code>HTMLDefinition</code> class, the file has been
223 partitioned into modular bits organized into categories
224 like <q>Hypertext</q>, <q>Lists</q> and <q>Tables</q>. The
225 design of these modules makes it possible to arbitrarily
226 add your own elements without ever having to patch a core
227 file. However, the interface is unintuitive, not
228 documented, and definitely going to change. Keep your eyes
229 on this one.</li>
230 <li>Rudimentary internationalization system implemented. It's
231 not used yet, but will become the foundation of a projected
232 error reporting feature HTML Purifier will be getting soon.</li>
233 <li><code>x</code> subtag now allowed in language codes.</li>
234 <li>Buggy chameleon support for <code>ins</code> and <code>del</code>
235 fixed.</li>
236 <li>Element by element AllowedAttribute declaration now possible
237 for global attributes. Instead of <code>*.class</code>, you can write
238 <code>span.class</code> (the old syntax still works, and enables
239 the attribute for all elements).</li>
240 <li>Fatal error when <abbr>PHP</abbr>4 <acronym>DOM</acronym>
241 <abbr>XML</abbr> extension was loaded now fixed. <strong>Update:</strong>
242 It seems that a lot of users run into this problem, as I know at least
243 five cases. Upgrade to 1.5.0 and it will be fixed, I promise!</li>
244 <li>Youtube filter regexp now multiline.</li>
245 </ul>
246 <p>...as well as an assortment of some code refactoring (all
247 bugfixes are covered above). See <a
248 href="http://hp.jpsband.org/svnroot/htmlpurifier/tags/1.5.0/NEWS">News</a>
249 for a complete changelog.</p>
250 </div>
251 </div>
254 <div class="item" id="news-rss-feed">
255 <h3 class="title"><abbr>RSS</abbr> feed!</h3>
256 <div class="date">Sat, 17 March 2007 5:42:12 EDT</div>
258 <div class="body">
259 <p>We have a shiny new <abbr>RSS</abbr> feed
260 at <a href="news.rss">news.rss</a>, which is hooked up to this
261 news feed. Subscribe for release notifications as well as random
262 news about HTML Purifier.</p>
263 </div>
264 </div>
266 </div> <!-- end news-container -->
268 <h2 id="Plugins">Plugins</h2>
270 <p>HTML Purifier is a great library to integrate with existing
271 <abbr>CMS</abbr>es and other applications or <acronym>WYSIWYG</acronym>
272 editors. Currently, we have plugins for:</p>
274 <ul>
275 <li><a href="http://bart.motd.be/projects/html-purifier-drupal-module">Drupal HTML Purifier Module</a> (beta) by Bart Jansens</li>
276 <li><a href="http://hp.jpsband.org/svnroot/htmlpurifier/trunk/plugins/modx.txt">MODx Content Management System</a></li>
277 </ul>
279 <blockquote class="fancy">
280 <div class="quote">
281 This plugin is on top of my favorite list[.] I am going to heavily
282 depend on it since my clients insist on having <acronym>WYSIWYG</acronym> and I insist on
283 having pages that validate and are semantically sound.
284 </div>
285 <div class="origin">
286 &mdash; David Molliere, <em>MODx Marketing &amp; Design Team</em>
287 </div>
288 </blockquote>
290 <p>Plugins for other major applications gladly accepted!</p>
293 <h2 id="Demo">Demo</h2>
295 <p>Enter your <abbr>HTML</abbr> and see how it will be filtered!</p>
296 <form id="filter" action="http://hp.jpsband.org/live/docs/examples/demo.php?post" method="post">
297 <fieldset>
298 <legend>HTML Purifier Input</legend>
299 <textarea name="html" cols="50" rows="10" id="html"></textarea>
300 <div><abbr>XHTML</abbr> 1.0 Strict output? <input type="checkbox" value="1" name="strict" /></div>
301 <div>
302 <input type="submit" value="Submit" name="submit" class="button" />
303 </div>
304 </fieldset>
305 </form>
307 <p>...or try these sample inputs:</p>
309 <ul>
310 <li><a href="http://hp.jpsband.org/live/docs/examples/demo.php?get&amp;html=%3Cimg+src%3D%22javascript%3Aevil%28%29%3B%22+onload%3D%22evil%28%29%3B%22+%2F%3E">Malicious code removed</a></li>
311 <li><a href="http://hp.jpsband.org/live/docs/examples/demo.php?html=%3Cb%3EBold&amp;submit=Submit">Missing end tags fixed</a></li>
312 <li><a href="http://hp.jpsband.org/live/docs/examples/demo.php?html=%3Cb%3EInline+%3Cdel%3Econtext+%3Cdiv%3ENo+block+allowed%3C%2Fdiv%3E%3C%2Fdel%3E%3C%2Fb%3E&amp;submit=Submit">Illegal nesting fixed</a></li>
313 <li><a href="http://hp.jpsband.org/live/docs/examples/demo.php?html=%3Ccenter%3ECentered%3C%2Fcenter%3E&amp;strict=1&amp;submit=Submit">Deprecated tags converted</a></li>
314 <li><a href="http://hp.jpsband.org/live/docs/examples/demo.php?html=%3Cspan+style%3D%22color%3A%23COW%3Bfloat%3Aaround%3Btext-decoration%3Ablink%3B%22%3EText%3C%2Fspan%3E&amp;submit=Submit"><abbr>CSS</abbr> validated</a></li>
315 <li><a href="http://hp.jpsband.org/live/docs/examples/demo.php?html=%3Ctable%3E%0D%0A++%3Ccaption%3E%0D%0A++++Cool+table%0D%0A++%3C%2Fcaption%3E%0D%0A++%3Ctfoot%3E%0D%0A++++%3Ctr%3E%0D%0A++++++%3Cth%3EI+can+do+so+much%21%3C%2Fth%3E%0D%0A++++%3C%2Ftr%3E%0D%0A++%3C%2Ftfoot%3E%0D%0A++%3Ctr%3E%0D%0A++++%3Ctd+style%3D%22font-size%3A16pt%3B%0D%0A++++++color%3A%23F00%3Bfont-family%3Asans-serif%3B%0D%0A++++++text-align%3Acenter%3B%22%3EWow%3C%2Ftd%3E%0D%0A++%3C%2Ftr%3E%0D%0A%3C%2Ftable%3E&amp;submit=Submit">Rich formatting preserved</a></li>
316 </ul>
318 <h2 id="Download">Download</h2>
320 <p>The current version is
321 <strong>1.6.0</strong>. Pick your distribution:</p>
323 <ul>
324 <li><a class="download" href="releases/htmlpurifier-1.6.0.tar.gz">HTML Purifier 1.6.0 (.tar.gz)</a> [<a href="releases/htmlpurifier-1.6.0.tar.gz.sig">sig</a>]</li>
325 <li><a class="download" href="releases/htmlpurifier-1.6.0.zip">HTML Purifier 1.6.0 (.zip)</a> [<a href="releases/htmlpurifier-1.6.0.zip.sig">sig</a>]</li>
326 <li><a class="download" href="releases/htmlpurifier-1.6.0-strict.tar.gz">HTML Purifier 1.6.0 PHP5-strict (.tar.gz)</a> [<a href="releases/htmlpurifier-1.6.0-strict.tar.gz.sig">sig</a>]</li>
327 <li><a class="download" href="releases/htmlpurifier-1.6.0-strict.zip">HTML Purifier 1.6.0 PHP5-strict (.zip)</a> [<a href="releases/htmlpurifier-1.6.0-strict.zip.sig">sig</a>]</li>
328 </ul>
330 <p>The <abbr>PHP</abbr>5-strict version is exactly the same
331 as the regular version with a few tweaks
332 to prevent it from complaining with
333 <a href="http://php.net/manual/en/ref.errorfunc.php#e-strict">E_STRICT</a>
334 warnings.This library is open-source, licensed under the
335 <a href="http://www.gnu.org/licenses/lgpl.html"><abbr>LGPL</abbr> v2.1+</a>.</p>
337 <p>HTML Purifier is also available as a <acronym>PEAR</acronym> package.
338 You can install it by executing:</p>
340 <pre class="command">pear channel-discover hp.jpsband.org
341 pear install hp/HTMLPurifier</pre>
343 <p>You can also grab the latest developmental code from our Subversion
344 repository. Simply execute this command:</p>
346 <pre class="command">svn co http://hp.jpsband.org/svnroot/htmlpurifier/trunk ./</pre>
348 <p>...or <a href="http://hp.jpsband.org/svnroot/htmlpurifier/trunk/">browse
349 anonymously</a> at that address. Previous releases can be obtained by browsing
350 the <a href="releases/">release directory</a>
351 or checking code out of the
352 <a href="http://hp.jpsband.org/svnroot/htmlpurifier/tags/">tags/
353 directory</a>.</p>
355 <p><acronym>SHA-1</acronym> checksums:</p>
357 <pre>
358 088569ae55d99bdbbee6031215ecc26f60489b70 htmlpurifier-1.6.0-strict.tar.gz
359 3deb033d6b20c22e7883cf2f7f719605fe6dd161 htmlpurifier-1.6.0-strict.zip
360 b4eed7787b84b7a86b24beaa5394616600780ceb htmlpurifier-1.6.0.tar.gz
361 3e375e83bc782e031362ce49c559e0d4f2511b6f htmlpurifier-1.6.0.zip
362 </pre>
364 <p>There are also <tt>.sig</tt> files which you can use to cryptographically verify
365 that the release is from me, Edward Z. Yang. You can find
366 my <a href="http://www.thewritingpot.com/gpgpubkey.asc">public key
367 here (0x869C48DA)</a>. My key's fingerprint is:
368 <tt>3FA8 E9A9 7385 B691 A6FC B3CB A933 BE7D 869C 48DA</tt>.</p>
370 <p>Verify with these commands:</p>
372 <pre class="command">gpg --verify <strong>$filename</strong>.sig</pre>
374 <p>You can be notified of new releases by a low-traffic announce list. Subscribe
375 here:</p>
377 <form method="post" action="http://scripts.dreamhost.com/add_list.cgi">
378 <input type="hidden" name="list" value="htmlpurifier@jpsband.org" />
379 <input type="hidden" name="domain" value="jpsband.org" />
380 <input type="hidden" name="emailit" value="1" />
381 <div>Name: <input name="name" /> E-mail: <input name="email" /></div>
382 <div><input type="submit" name="submit" value="Suscribe to Announcement List" />
383 <input type="submit" name="unsub" value="Unsubscribe" /></div>
384 </form>
386 <h2 id="Resources">Resources</h2>
387 <ul>
388 <li><strong><a href="http://hp.jpsband.org/live/docs/">End-User
389 Documentation</a></strong> &mdash; In-depth documents on how to get
390 the most out of HTML Purifier.</li>
391 <li><a href="mantis/">Mantis Bugtracker</a> &mdash; Found a bug? Report
392 it here!</li>
393 <li><a href="phorum/">Support Forum</a> &mdash; Talk about all things
394 HTML Purifier.</li>
395 <li><a href="http://hp.jpsband.org/live/smoketests/printDefinition.php">Print
396 Definition</a> &mdash; If you want to actually see what HTML Purifier's
397 filtering rules are, look no further than to this page. You can even
398 experiment with the configuration to see how things respond to different
399 directives.</li>
400 <li><a href="http://hp.jpsband.org/live/smoketests/xssAttacks.php"><abbr>XSS</abbr>
401 Attacks Smoketest</a> &mdash; Tests how well HTML Purifier fares
402 against RSnake's famous cheatsheet of <abbr>XSS</abbr> attacks.</li>
403 <li><a href="http://hp.jpsband.org/live/TODO">Roadmap</a>
404 &mdash; Subject to lots of delays, but it's a glimpse of the future</li>
405 <li><a href="http://hp.jpsband.org/live/art/">Artwork</a>
406 &mdash; Extra media goodies.</li>
407 <li><a href="http://hp.jpsband.org/live/configdoc/plain.html">Configuration
408 documentation</a> &mdash; See the <code>INSTALL</code> document on how to
409 configure your HTML Purifier installation.</li>
410 <li><a href="http://hp.jpsband.org/doxygen/html/">Doxygen-generated
411 Documentation</a> &mdash; No class left undocumented! Cross-referenced
412 code! A must-read for any prospective HTML Purifier hacker.
413 (close by, <a href="http://hp.jpsband.org/phpdoc/">PHPDoc-generated
414 Documentation.</a>)</li>
415 </ul>
417 <h2 id="Propaganda">Spread the Word!</h2>
419 <p>Help spread awareness about HTML Purifier by:</p>
421 <ul>
422 <li><a
423 href="http://del.icio.us/post?v=4&amp;noui&amp;url=http://hp.jpsband.org/&amp;title=HTML%20Purifier%20-%20Filter%20your%20HTML%20the%20standards-compliant%20way!"
424 id="delicious">Bookmarking this website</a> on your <strong>del.icio.us</strong> account, and/or</li>
425 <li>
426 <div>Including this little <strong>label</strong> on your website:
427 <a href="http://hp.jpsband.org/"><img
428 src="http://hp.jpsband.org/live/art/powered.png"
429 alt="Powered by HTML Purifier" border="0" /></a>, with this code:
430 </div>
431 <pre>&lt;a href=&quot;http://hp.jpsband.org/&quot;&gt;&lt;img
432 src=&quot;http://hp.jpsband.org/live/art/powered.png&quot;
433 alt=&quot;Powered by HTML Purifier&quot; border=&quot;0&quot; /&gt;&lt;/a&gt;</pre>
434 </li>
435 </ul>
437 <h2 id="Contact">Contact</h2>
439 <p>You can send me an email at
440 <a href="mailto:htmlpurifier@jpsband.org">htmlpurifier@jpsband.org</a>.
441 However, I prefer that you use the forums for asking general support
442 questions (response time will be the same, I promise!)
443 Any emails I receive will be considered public: if I think a
444 solution I thought up to help you would be particularly useful to others,
445 expect it to show up on the website.</p>
447 </div>
449 </body>
450 </html>