1NEWS ( CHANGELOG and HISTORY )                                     HTMLPurifier
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  3
  4= KEY ====================
  5    # Breaks back-compat
  6    ! Feature
  7    - Bugfix
  8      + Sub-comment
  9    . Internal change
 10==========================
 11
 124.12.0, released 2019-10-27
 13! PHP 7.4 is supported, thank you Witold Wasiczko, Mateuz Turcza and
 14  Edi Modrić
 15- PHPDocs for HTMLModule::addElement() and Bool attr are fixed (thanks
 16  Mateusz)
 17
 184.11.0, released 2019-07-14
 19# SafeScripting now matches case-sensitively against its whitelist (previously it was
 20  case-insensitive.)  Thanks Dimitri Gritsajuk <gritsajuk.dimitri@gmail.com>
 21  for reporting.
 22! New directive %Core.AllowParseManyTags which allows parsing of many nested tags.
 23  Thanks M. Suzuki <msuzuki1986@gmail.com> for contributing the patch.
 24! purifyArray now supports multidimensional arrays.  Thanks
 25  Sandro Miguel Marques <sandromiguel@sandromiguel.com> for contributing this patch.
 26! initial and inherit settings available for width, height, and the min-/max-
 27  versions thereof.  Thanks Michael Kliewe <info@phpgansta.de> for contributing
 28  this patch.
 29! More color names are supported.  Thanks Daijobou for contributing.
 30- Compatibility fixes for PHP 7.3, including new CI for PHP 7.3
 31  (thank you Lukas Neumann <lksnmnn@gmail.com>) and removal of
 32  reserved words in our constants (thanks Darko Hrgovic <darko@darkodev.com>
 33- Compatibility fixes for HHVM.  Thanks Mateusz Turcza for contributing
 34  this fix.
 35- HTML Purifier now never defines __autoload, fixing #196.  Thanks
 36  Michael Kliewe for reporting.
 37- In some situations, Config.php would report an undefined index: class
 38  error; this has been fixed.  Thanks DiLong Fa for contributing
 39  this fix.
 40- We no longer produce <script /> tags; we always explicitly write
 41  out the open and close tag.  Thanks Dimitri Gritsajuk
 42  <gritsajuk.dimitri@gmail.com> for contributing this fix.
 43- Better compatibility when IDNA constants are not present.  Thanks
 44  Mateusz Turcza <xemlock@gmail.com> for contributing this fix.
 45
 464.10.0, released 2018-02-22
 47# PHP 5.3 is no longer officially supported by HTML Purifier
 48  (we did not specifically break support, but we are no longer
 49  testing on PHP 5.3)
 50! Relative CSS length units are now supported
 51- A few PHP 7.2 compatibility fixes, thanks John Flatness
 52  <john@zerocrates.org>
 53- Improve portability with old versions of libxml which don't
 54  support accessing the data of a node
 55- IDNA2008 is now used for converting domains to ASCII, fixing
 56  some rather strange bugs with international domains
 57- Fix race condition resulting in E_WARNING when creating
 58  directories with Serializer
 59
 604.9.3, released 2017-06-02
 61- Workaround PHP 7.1 infinite loop when opcode cache is enabled.
 62  Thanks @Xiphin (#134, #135)
 63- Don't use autoloader when testing for DOMDocument.  Hypothetically,
 64  this could cause your install to start using DirectLex if you had
 65  previously been monkeypatching in a custom, autoloaded implementation
 66  of DOMDocument.  Don't do that.  Thanks @Izumi-kun (#130)
 67
 684.9.2, released 2017-03-12
 69- Fixes PHP 5.3 compatibility
 70- Fix breakage when decoding decimal entities.  Thanks @rybakit (#129)
 71
 724.9.1, released 2017-03-08
 73! %URI.DefaultScheme can now be set to null, in which case
 74  all relative paths are removed.
 75! New CSS properties: min-width, max-width, min-height, max-height (#94)
 76! Transparency (rgba) and hsl/hsla supported where color CSS is present.
 77  Thanks @fxbt for contributing the patch. (#118)
 78- When idn_to_ascii is defined, we might accept malformed
 79  hostnames.  Apply validation to the result in such cases.
 80- Close directory when done in Serializer DefinitionCache (#100)
 81- Deleted some asserts to avoid linters from choking (#97)
 82- Rework Serializer cache behavior to avoid chmod'ing if possible (#32)
 83- Embedded semicolons in strings in CSS are now handled correctly!
 84- We accidentally dropped certain Unicode characters if there was
 85  one or more invalid characters.  This has been fixed, thanks
 86  to mpyw <ryosuke_i_628@yahoo.co.jp>
 87- Fix for "Don't truncate upon encountering </div> when using DOMLex"
 88  caused a regression with HTML 4.01 Strict parsing with libxml 2.9.1
 89  (and maybe later versions, but known OK with libxml 2.9.4).  The
 90  fix is to go about handling truncation a bit more cleverly so that
 91  we can wrap with divs (sidestepping the bug) but slurping out the
 92  rest of the text in case it ran off the end.  (#78)
 93- Fix PREG_BACKTRACK_LIMIT_ERROR in HTMLPurifier_Filter_ExtractStyle.
 94  Thanks @breathbath for contributing the report and fix (#120)
 95- Fix entity decoding algorithm to be more conservative about
 96  decoding entities that are missing trailing semicolon.
 97  To get old behavior, set %Core.LegacyEntityDecoder to true.
 98  (#119)
 99- Workaround libxml bug when HTML tags are embedded inside
100  script tags.  To disable workaround set %Core.AggressivelyRemoveScript
101  to false. (#83)
102# By default, when a link has a target attribute associated
103  with it, we now also add rel="noopener" in order to
104  prevent the new window from being able to overwrite
105  the original frame.  To disable this protection,
106  set %HTML.TargetNoopener to FALSE.
107
1084.9.0 was cut on Git but never properly released; when we did the
109real release we decided to skip this version number.
110
1114.8.0, released 2016-07-16
112# By default, when a link has a target attribute associated
113  with it, we now also add rel="noreferrer" in order to
114  prevent the new window from being able to overwrite
115  the original frame.  To disable this protection,
116  set %HTML.TargetNoreferrer to FALSE.
117! Full PHP 7 compatibility, the test suite is ALL GO.
118! %CSS.AllowDuplicates permits duplicate CSS properties.
119! Support for 'tel' URIs.
120! Partial support for 'border-radius' properties when %CSS.AllowProprietary is true.
121  The slash syntax, i.e., 'border-radius: 2em 1em 4em / 0.5em 3em' is not
122  yet supported.
123! %Attr.ID.HTML5 turns on HTML5-style ID handling.
124- alt truncation could result in malformed UTF-8 sequence. Don't
125  truncate.  Thanks Brandon Farber for reporting.
126- Linkify regex is smarter, based off of Gruber's regex.
127- IDNA supported natively on PHP 5.3 and later.
128- Non all-numeric top-level names (e.g., foo.1f, 1f) are now
129  allowed.
130- Minor bounds error fix to squash a PHP 7 notice.
131- Support non-/tmp temporary directories for data:// validation
132- Give a better error message when a user attempts to allow
133  ul/ol without allowing li.
134- On some versions of PHP, the Serializer DefinitionCache could
135  infinite loop when the directory exists but is not listable. (#49)
136- Don't match for <body> inside comments with
137  %Core.ConvertDocumentToFragment. (#67)
138- SafeObject is now less case sensitive. (#57)
139- AutoFormat.RemoveEmpty.Predicate now correctly renders in
140  web form. (#85)
141
1424.7.0, released 2015-08-04
143# opacity is now considered a "tricky" CSS property rather than a
144  proprietary one.
145! %AutoFormat.RemoveEmpty.Predicate for specifying exactly when
146  an element should be considered "empty" (maybe preserve if it
147  has attributes), and modify iframe support so that the iframe
148  is removed if it is missing a src attribute.  Thanks meeva for
149  reporting.
150- Don't truncate upon encountering </div> when using DOMLex.  Thanks
151  Myrto Christina for finally convincing me to fix this.
152- Update YouTube filter for new code.
153- Fix parsing of rgb() values with spaces in them for 'border'
154  attribute.
155- Don't remove foo="" attributes if foo is a boolean attribute.  Thanks
156  valME for reporting.
157
1584.6.0, released 2013-11-30
159# Secure URI munge hashing algorithm has changed to hash_hmac("sha256", $url, $secret).
160  Please update any verification scripts you may have.
161# URI parsing algorithm was made more strict, so only prefixes which
162  looks like schemes will actually be schemes.  Thanks
163  Michael Gusev <mgusev@sugarcrm.com> for fixing.
164# %Core.EscapeInvalidChildren is no longer supported, and no longer does
165  anything.
166! New directive %Core.AllowHostnameUnderscore which allows underscores
167  in hostnames.
168- Eliminate quadratic behavior in DOMLex by using a proper queue.
169  Thanks Ole Laursen for noticing this.
170- Rewritten MakeWellFormed/FixNesting implementation eliminates quadratic
171  behavior in the rest of the purificaiton pipeline.  Thanks Chedburn
172  Networks for sponsoring this work.
173- Made Linkify URL parser a bit less permissive, so that non-breaking
174  spaces and commas are not included as part of URL.  Thanks nAS for fixing.
175- Fix some bad interactions with %HTML.Allowed and injectors.  Thanks
176  David Hirtz for reporting.
177- Fix infinite loop in DirectLex. Thanks Ashar Javed (@soaj1664ashar)
178  for reporting.
179
1804.5.0, released 2013-02-17
181# Fix bug where stacked attribute transforms clobber each other;
182  this also means it's no longer possible to override attribute
183  transforms in later modules.  No internal code was using this
184  but this may break some clients.
185# We now use SHA-1 to identify cached definitions, instead of MD5.
186! Support display:inline-block
187! Support for more white-space CSS values.
188! Permit underscores in font families
189! Support for page-break-* CSS3 properties when proprietary properties
190  are enabled.
191! New directive %Core.DisableExcludes; can be set to 'true' to turn off
192  SGML excludes checking.  If HTML Purifier is removing too much text
193  and you don't care about full standards compliance, try setting this to
194  'true'.
195- Use prepend for SPL autoloading on PHP 5.3 and later.
196- Fix bug with nofollow transform when pre-existing rel exists.
197- Fix bug where background:url() always gets lower-cased
198  (but not background-image:url())
199- Fix bug with non lower-case color names in HTML
200- Fix bug where data URI validation doesn't remove temporary files.
201  Thanks Javier Marín Ros <javiermarinros@gmail.com> for reporting.
202- Don't remove certain empty tags on RemoveEmpty.
203
2044.4.0, released 2012-01-18
205# Removed PEARSax3 handler.
206# URI.Munge now munges URIs inside the same host that go from https
207  to http.  Reported by Neike Taika-Tessaro.
208# Core.EscapeNonASCIICharacters now always transforms entities to
209  entities, even if target encoding is UTF-8.
210# Tighten up selector validation in ExtractStyleBlocks.
211  Non-syntactically valid selectors are now rejected, along with
212  some of the more obscure ones such as attribute selectors, the
213  :lang pseudoselector, and anything not in CSS2.1.  Furthermore,
214  ID and class selectors now work properly with the relevant
215  configuration attributes.  Also, mute errors when parsing CSS
216  with CSS Tidy.  Reported by Mario Heiderich and Norman Hippert.
217! Added support for 'scope' attribute on tables.
218! Added %HTML.TargetBlank, which adds target="blank" to all outgoing links.
219! Properly handle sub-lists directly nested inside of lists in
220  a standards compliant way, by moving them into the preceding <li>
221! Added %HTML.AllowedComments and %HTML.AllowedCommentsRegexp for
222  limited allowed comments in untrusted situations.
223! Implement iframes, and allow them to be used in untrusted mode with
224  %HTML.SafeIframe and %URI.SafeIframeRegexp.  Thanks Bradley M. Froehle
225  <brad.froehle@gmail.com> for submitting an initial version of the patch.
226! The Forms module now works properly for transitional doctypes.
227! Added support for internationalized domain names. You need the PEAR
228  Net_IDNA2 module to be in your path; if it is installed, ensure the
229  class can be loaded and then set %Core.EnableIDNA to true.
230- Color keywords are now case insensitive.  Thanks Yzmir Ramirez
231  <yramirez-htmlpurifier@adicio.com> for reporting.
232- Explicitly initialize anonModule variable to null.
233- Do not duplicate nofollow if already present.  Thanks 178
234  for reporting.
235- Do not add nofollow if hostname matches our current host.  Thanks 178
236  for reporting, and Neike Taika-Tessaro for helping diagnose.
237- Do not unset parser variable; this fixes intermittent serialization
238  problems.  Thanks Neike Taika-Tessaro for reporting, bill
239  <10010tiger@gmail.com> for diagnosing.
240- Fix iconv truncation bug, where non-UTF-8 target encodings see
241  output truncated after around 8000 characters.  Thanks Jörg Ludwig
242  <joerg.ludwig@iserv.eu> for reporting.
243- Fix broken table content model for XHTML1.1 (and also earlier
244  versions, although the W3C validator doesn't catch those violations).
245  Thanks GlitchMr <glitch.mr@gmail.com> for reporting.
246
2474.3.0, released 2011-03-27
248# Fixed broken caching of customized raw definitions, but requires an
249  API change.  The old API still works but will emit a warning,
250  see http://htmlpurifier.org/docs/enduser-customize.html#optimized
251  for how to upgrade your code.
252# Protect against Internet Explorer innerHTML behavior by specially
253  treating attributes with backticks but no angled brackets, quotes or
254  spaces.  This constitutes a slight semantic change, which can be
255  reverted using %Output.FixInnerHTML.  Reported by Neike Taika-Tessaro
256  and Mario Heiderich.
257# Protect against cssText/innerHTML by restricting allowed characters
258  used in fonts further than mandated by the specification and encoding
259  some extra special characters in URLs.  Reported by Neike
260  Taika-Tessaro and Mario Heiderich.
261! Added %HTML.Nofollow to add rel="nofollow" to external links.
262! More types of SPL autoloaders allowed on later versions of PHP.
263! Implementations for position, top, left, right, bottom, z-index
264  when %CSS.Trusted is on.
265! Add %Cache.SerializerPermissions option for custom serializer
266  directory/file permissions
267! Fix longstanding bug in Flash support for non-IE browsers, and
268  allow more wmode attributes.
269! Add %CSS.AllowedFonts to restrict permissible font names.
270- Switch to an iterative traversal of the DOM, which prevents us
271  from running out of stack space for deeply nested documents.
272  Thanks Maxim Krizhanovsky for contributing a patch.
273- Make removal of conditional IE comments ungreedy; thanks Bernd
274  for reporting.
275- Escape CDATA before removing Internet Explorer comments.
276- Fix removal of id attributes under certain conditions by ensuring
277  armor attributes are preserved when recreating tags.
278- Check if schema.ser was corrupted.
279- Check if zend.ze1_compatibility_mode is on, and error out if it is.
280  This safety check is only done for HTMLPurifier.auto.php; if you
281  are using standalone or the specialized includes files, you're
282  expected to know what you're doing.
283- Stop repeatedly writing the cache file after I'm done customizing a
284  raw definition.  Reported by ajh.
285- Switch to using require_once in the Bootstrap to work around bad
286  interaction with Zend Debugger and APC.  Reported by Antonio Parraga.
287- Fix URI handling when hostname is missing but scheme is present.
288  Reported by Neike Taika-Tessaro.
289- Fix missing numeric entities on DirectLex; thanks Neike Taika-Tessaro
290  for reporting.
291- Fix harmless notice from indexing into empty string.  Thanks Matthijs
292  Kooijman <matthijs@stdin.nl> for reporting.
293- Don't autoclose no parent elements are able to support the element
294  that triggered the autoclose.  In particular fixes strange behavior
295  of stray <li> tags.  Thanks pkuliga@gmail.com for reporting and
296  Neike Taika-Tessaro <pinkgothic@gmail.com> for debugging assistance.
297
2984.2.0, released 2010-09-15
299! Added %Core.RemoveProcessingInstructions, which lets you remove
300  <? ... ?> statements.
301! Added %URI.DisableResources functionality; the directive originally
302  did nothing.  Thanks David Rothstein for reporting.
303! Add documentation about configuration directive types.
304! Add %CSS.ForbiddenProperties configuration directive.
305! Add %HTML.FlashAllowFullScreen to permit embedded Flash objects
306  to utilize full-screen mode.
307! Add optional support for the <code>file</code> URI scheme, enable
308  by explicitly setting %URI.AllowedSchemes.
309! Add %Core.NormalizeNewlines options to allow turning off newline
310  normalization.
311- Fix improper handling of Internet Explorer conditional comments
312  by parser.  Thanks zmonteca for reporting.
313- Fix missing attributes bug when running on Mac Snow Leopard and APC.
314  Thanks sidepodcast for the fix.
315- Warn if an element is allowed, but an attribute it requires is
316  not allowed.
317
3184.1.1, released 2010-05-31
319- Fix undefined index warnings in maintenance scripts.
320- Fix bug in DirectLex for parsing elements with a single attribute
321  with entities.
322- Rewrite CSS output logic for font-family and url().  Thanks Mario
323  Heiderich <mario.heiderich@googlemail.com> for reporting and Takeshi
324  Terada <t-terada@violet.plala.or.jp> for suggesting the fix.
325- Emit an error for CollectErrors if a body is extracted
326- Fix bug where in background-position for center keyword handling.
327- Fix infinite loop when a wrapper element is inserted in a context
328  where it's not allowed.  Thanks Lars <lars@renoz.dk> for reporting.
329- Remove +x bit and shebang from index.php; only supported mode is to
330  explicitly call it with php.
331- Make test script less chatty when log_errors is on.
332
3334.1.0, released 2010-04-26
334! Support proprietary height attribute on table element
335! Support YouTube slideshows that contain /cp/ in their URL.
336! Support for data: URI scheme; not enabled by default, add it using
337  %URI.AllowedSchemes
338! Support flashvars when using %HTML.SafeObject and %HTML.SafeEmbed.
339! Support for Internet Explorer compatibility with %HTML.SafeObject
340  using %Output.FlashCompat.
341! Handle <ol><ol> properly, by inserting the necessary <li> tag.
342- Always quote the insides of url(...) in CSS.
343
3444.0.0, released 2009-07-07
345# APIs for ConfigSchema subsystem have substantially changed. See
346  docs/dev-config-bcbreaks.txt for details; in essence, anything that
347  had both namespace and directive now have a single unified key.
348# Some configuration directives were renamed, specifically:
349    %AutoFormatParam.PurifierLinkifyDocURL -> %AutoFormat.PurifierLinkify.DocURL
350    %FilterParam.ExtractStyleBlocksEscaping -> %Filter.ExtractStyleBlocks.Escaping
351    %FilterParam.ExtractStyleBlocksScope -> %Filter.ExtractStyleBlocks.Scope
352    %FilterParam.ExtractStyleBlocksTidyImpl -> %Filter.ExtractStyleBlocks.TidyImpl
353  As usual, the old directive names will still work, but will throw E_NOTICE
354  errors.
355# The allowed values for class have been relaxed to allow all of CDATA for
356  doctypes that are not XHTML 1.1 or XHTML 2.0.  For old behavior, set
357  %Attr.ClassUseCDATA to false.
358# Instead of appending the content model to an old content model, a blank
359  element will replace the old content model.  You can use #SUPER to get
360  the old content model.
361! More robust support for name="" and id=""
362! HTMLPurifier_Config::inherit($config) allows you to inherit one
363  configuration, and have changes to that configuration be propagated
364  to all of its children.
365! Implement %HTML.Attr.Name.UseCDATA, which relaxes validation rules on
366  the name attribute when set. Use with care. Thanks Ian Cook for
367  sponsoring.
368! Implement %AutoFormat.RemoveEmpty.RemoveNbsp, which removes empty
369  tags that contain non-breaking spaces as well other whitespace. You
370  can also modify which tags should have &nbsp; maintained with
371  %AutoFormat.RemoveEmpty.RemoveNbsp.Exceptions.
372! Implement %Attr.AllowedClasses, which allows administrators to restrict
373  classes users can use to a specified finite set of classes, and
374  %Attr.ForbiddenClasses, which is the logical inverse.
375! You can now maintain your own configuration schema directories by
376  creating a config-schema.php file or passing an extra argument. Check
377  docs/dev-config-schema.html for more details.
378! Added HTMLPurifier_Config->serialize() method, which lets you save away
379  your configuration in a compact serial file, which you can unserialize
380  and use directly without having to go through the overhead of setup.
381- Fix bug where URIDefinition would not get cleared if it's directives got
382  changed.
383- Fix fatal error in HTMLPurifier_Encoder on certain platforms (probably NetBSD 5.0)
384- Fix bug in Linkify autoformatter involving <a><span>http://foo</span></a>
385- Make %URI.Munge not apply to links that have the same host as your host.
386- Prevent stray </body> tag from truncating output, if a second </body>
387  is present.
388. Created script maintenance/rename-config.php for renaming a configuration
389  directive while maintaining its alias.  This script does not change source code.
390. Implement namespace locking for definition construction, to prevent
391  bugs where a directive is used for definition construction but is not
392  used to construct the cache hash.
393
3943.3.0, released 2009-02-16
395! Implement CSS property 'overflow' when %CSS.AllowTricky is true.
396! Implement generic property list classess
397- Fix bug with testEncodingSupportsASCII() algorithm when iconv() implementation
398  does not do the "right thing" with characters not supported in the output
399  set.
400- Spellcheck UTF-8: The Secret To Character Encoding
401- Fix improper removal of the contents of elements with only whitespace. Thanks
402  Eric Wald for reporting.
403- Fix broken test suite in versions of PHP without spl_autoload_register()
404- Fix degenerate case with YouTube filter involving double hyphens.
405  Thanks Pierre Attar for reporting.
406- Fix YouTube rendering problem on certain versions of Firefox.
407- Fix CSSDefinition Printer problems with decorators
408- Add text parameter to unit tests, forces text output
409. Add verbose mode to command line test runner, use (--verbose)
410. Turn on unit tests for UnitConverter
411. Fix missing version number in configuration %Attr.DefaultImageAlt (added 3.2.0)
412. Fix newline errors that caused spurious failures when CRLF HTML Purifier was
413  tested on Linux.
414. Removed trailing whitespace from all text files, see
415  remote-trailing-whitespace.php maintenance script.
416. Convert configuration to use property list backend.
417
4183.2.0, released 2008-10-31
419# Using %Core.CollectErrors forces line number/column tracking on, whereas
420  previously you could theoretically turn it off.
421# HTMLPurifier_Injector->notifyEnd() is formally deprecated. Please
422  use handleEnd() instead.
423! %Output.AttrSort for when you need your attributes in alphabetical order to
424  deal with a bug in FCKEditor. Requested by frank farmer.
425! Enable HTML comments when %HTML.Trusted is on. Requested by Waldo Jaquith.
426! Proper support for name attribute. It is now allowed and equivalent to the id
427  attribute in a and img tags, and is only converted to id when %HTML.TidyLevel
428  is heavy (for all doctypes).
429! %AutoFormat.RemoveEmpty to remove some empty tags from documents. Please don't
430  use on hand-written HTML.
431! Add error-cases for unsupported elements in MakeWellFormed. This enables
432  the strategy to be used, standalone, on untrusted input.
433! %Core.AggressivelyFixLt is on by default. This causes more sensible
434  processing of left angled brackets in smileys and other whatnot.
435! Test scripts now have a 'type' parameter, which lets you say 'htmlpurifier',
436  'phpt', 'vtest', etc. in order to only execute those tests. This supercedes
437  the --only-phpt parameter, although for backwards-compatibility the flag
438  will still work.
439! AutoParagraph auto-formatter will now preserve double-newlines upon output.
440  Users who are not performing inbound filtering, this may seem a little
441  useless, but as a bonus, the test suite and handling of edge cases is also
442  improved.
443! Experimental implementation of forms for %HTML.Trusted
444! Track column numbers when maintain line numbers is on
445! Proprietary 'background' attribute on table-related elements converted into
446  corresponding CSS.  Thanks Fusemail for sponsoring this feature!
447! Add forward(), forwardUntilEndToken(), backward() and current() to Injector
448  supertype.
449! HTMLPurifier_Injector->handleEnd() permits modification to end tokens. The
450  time of operation varies slightly from notifyEnd() as *all* end tokens are
451  processed by the injector before they are subject to the well-formedness rules.
452! %Attr.DefaultImageAlt allows overriding default behavior of setting alt to
453  basename of image when not present.
454! %AutoFormat.DisplayLinkURI neuters <a> tags into plain text URLs.
455- Fix two bugs in %URI.MakeAbsolute; one involving empty paths in base URLs,
456  the other involving an undefined $is_folder error.
457- Throw error when %Core.Encoding is set to a spurious value. Previously,
458  this errored silently and returned false.
459- Redirected stderr to stdout for flush error output.
460- %URI.DisableExternal will now use the host in %URI.Base if %URI.Host is not
461  available.
462- Do not re-munge URL if the output URL has the same host as the input URL.
463  Requested by Chris.
464- Fix error in documentation regarding %Filter.ExtractStyleBlocks
465- Prevent <![CDATA[<body></body>]]> from triggering %Core.ConvertDocumentToFragment
466- Fix bug with inline elements in blockquotes conflicting with strict doctype
467- Detect if HTML support is disabled for DOM by checking for loadHTML() method.
468- Fix bug where dots and double-dots in absolute URLs without hostname were
469  not collapsed by URIFilter_MakeAbsolute.
470- Fix bug with anonymous modules operating on SafeEmbed or SafeObject elements
471  by reordering their addition.
472- Will now throw exception on many error conditions during lexer creation; also
473  throw an exception when MaintainLineNumbers is true, but a non-tracksLineNumbers
474  is being used.
475- Detect if domxml extension is loaded, and use DirectLEx accordingly.
476- Improve handling of big numbers with floating point arithmetic in UnitConverter.
477  Reported by David Morton.
478. Strategy_MakeWellFormed now operates in-place, saving memory and allowing
479  for more interesting filter-backtracking
480. New HTMLPurifier_Injector->rewind() functionality, allows injectors to rewind
481  index to reprocess tokens.
482. StringHashParser now allows for multiline sections with "empty" content;
483  previously the section would remain undefined.
484. Added --quick option to multitest.php, which tests only the most recent
485  release for each series.
486. Added --distro option to multitest.php, which accepts either 'normal' or
487  'standalone'. This supercedes --exclude-normal and --exclude-standalone
488
4893.1.1, released 2008-06-19
490# %URI.Munge now, by default, does not munge resources (for example, <img src="">)
491  In order to enable this again, please set %URI.MungeResources to true.
492! More robust imagecrash protection with height/width CSS with %CSS.MaxImgLength,
493  and height/width HTML with %HTML.MaxImgLength.
494! %URI.MungeSecretKey for secure URI munging. Thanks Chris
495  for sponsoring this feature. Check out the corresponding documentation
496  for details. (Att Nightly testers: The API for this feature changed before
497  the general release. Namely, rename your directives %URI.SecureMungeSecretKey =>
498  %URI.MungeSecretKey and and %URI.SecureMunge => %URI.Munge)
499! Implemented post URI filtering. Set member variable $post to true to set
500  a URIFilter as such.
501! Allow modules to define injectors via $info_injector. Injectors are
502  automatically disabled if injector's needed elements are not found.
503! Support for "safe" objects added, use %HTML.SafeObject and %HTML.SafeEmbed.
504  Thanks Chris for sponsoring. If you've been using ad hoc code from the
505  forums, PLEASE use this instead.
506! Added substitutions for %e, %n, %a and %p in %URI.Munge (in order,
507  embedded, tag name, attribute name, CSS property name). See %URI.Munge
508  for more details. Requested by Jochem Blok.
509- Disable percent height/width attributes for img.
510- AttrValidator operations are now atomic; updates to attributes are not
511  manifest in token until end of operations. This prevents naughty internal
512  code from directly modifying CurrentToken when they're not supposed to.
513  This semantics change was requested by frank farmer.
514- Percent encoding checks enabled for URI query and fragment
515- Fix stray backslashes in font-family; CSS Unicode character escapes are
516  now properly resolved (although *only* in font-family). Thanks Takeshi Terada
517  for reporting.
518- Improve parseCDATA algorithm to take into account newline normalization
519- Account for browser confusion between Yen character and backslash in
520  Shift_JIS encoding. This fix generalizes to any other encoding which is not
521  a strict superset of printable ASCII. Thanks Takeshi Terada for reporting.
522- Fix missing configuration parameter in Generator calls. Thanks vs for the
523  partial patch.
524- Improved adherence to Unicode by checking for non-character codepoints.
525  Thanks Geoffrey Sneddon for reporting. This may result in degraded
526  performance for extremely large inputs.
527- Allow CSS property-value pair ''text-decoration: none''. Thanks Jochem Blok
528  for reporting.
529. Added HTMLPurifier_UnitConverter and HTMLPurifier_Length for convenient
530  handling of CSS-style lengths. HTMLPurifier_AttrDef_CSS_Length now uses
531  this class.
532. API of HTMLPurifier_AttrDef_CSS_Length changed from __construct($disable_negative)
533  to __construct($min, $max). __construct(true) is equivalent to
534  __construct('0').
535. Added HTMLPurifier_AttrDef_Switch class
536. Rename HTMLPurifier_HTMLModule_Tidy->construct() to setup() and bubble method
537  up inheritance hierarchy to HTMLPurifier_HTMLModule. All HTMLModules
538  get this called with the configuration object.  All modules now
539  use this rather than __construct(), although legacy code using constructors
540  will still work--the new format, however, lets modules access the
541  configuration object for HTML namespace dependant tweaks.
542. AttrDef_HTML_Pixels now takes a single construction parameter, pixels.
543. ConfigSchema data-structure heavily optimized; on average it uses a third
544  the memory it did previously. The interface has changed accordingly,
545  consult changes to HTMLPurifier_Config for details.
546. Variable parsing types now are magic integers instead of strings
547. Added benchmark for ConfigSchema
548. HTMLPurifier_Generator requires $config and $context parameters. If you
549  don't know what they should be, use HTMLPurifier_Config::createDefault()
550  and new HTMLPurifier_Context().
551. Printers now properly distinguish between output configuration, and
552  target configuration. This is not applicable to scripts using
553  the Printers for HTML Purifier related tasks.
554. HTML/CSS Printers must be primed with prepareGenerator($gen_config), otherwise
555  fatal errors will ensue.
556. URIFilter->prepare can return false in order to abort loading of the filter
557. Factory for AttrDef_URI implemented, URI#embedded to indicate URI that embeds
558  an external resource.
559. %URI.Munge functionality factored out into a post-filter class.
560. Added CurrentCSSProperty context variable during CSS validation
561
5623.1.0, released 2008-05-18
563# Unnecessary references to objects (vestiges of PHP4) removed from method
564  signatures.  The following methods do not need references when assigning from
565  them and will result in E_STRICT errors if you try:
566    + HTMLPurifier_Config->get*Definition() [* = HTML, CSS]
567    + HTMLPurifier_ConfigSchema::instance()
568    + HTMLPurifier_DefinitionCacheFactory::instance()
569    + HTMLPurifier_DefinitionCacheFactory->create()
570    + HTMLPurifier_DoctypeRegistry->register()
571    + HTMLPurifier_DoctypeRegistry->get()
572    + HTMLPurifier_HTMLModule->addElement()
573    + HTMLPurifier_HTMLModule->addBlankElement()
574    + HTMLPurifier_LanguageFactory::instance()
575# Printer_ConfigForm's get*() functions were static-ified
576# %HTML.ForbiddenAttributes requires attribute declarations to be in the
577  form of tag@attr, NOT tag.attr (which will throw an error and won't do
578  anything). This is for forwards compatibility with XML; you'd do best
579  to migrate an %HTML.AllowedAttributes directives to this syntax too.
580! Allow index to be false for config from form creation
581! Added HTMLPurifier::VERSION constant
582! Commas, not dashes, used for serializer IDs. This change is forwards-compatible
583  and allows for version numbers like "3.1.0-dev".
584! %HTML.Allowed deals gracefully with whitespace anywhere, anytime!
585! HTML Purifier's URI handling is a lot more robust, with much stricter
586  validation checks and better percent encoding handling. Thanks Gareth Heyes
587  for indicating security vulnerabilities from lax percent encoding.
588! Bootstrap autoloader deals more robustly with classes that don't exist,
589  preventing class_exists($class, true) from barfing.
590- InterchangeBuilder now alphabetizes its lists
591- Validation error in configdoc output fixed
592- Iconv and other encoding errors muted even with custom error handlers that
593  do not honor error_reporting
594- Add protection against imagecrash attack with CSS height/width
595- HTMLPurifier::instance() created for consistency, is equivalent to getInstance()
596- Fixed and revamped broken ConfigForm smoketest
597- Bug with bool/null fields in Printer_ConfigForm fixed
598- Bug with global forbidden attributes fixed
599- Improved error messages for allowed and forbidden HTML elements and attributes
600- Missing (or null) in configdoc documentation restored
601- If DOM throws and exception during parsing with PH5P (occurs in newer versions
602  of DOM), HTML Purifier punts to DirectLex
603- Fatal error with unserialization of ScriptRequired
604- Created directories are now chmod'ed properly
605- Fixed bug with fallback languages in LanguageFactory
606- Standalone testing setup properly with autoload
607. Out-of-date documentation revised
608. UTF-8 encoding check optimization as suggested by Diego
609. HTMLPurifier_Error removed in favor of exceptions
610. More copy() function removed; should use clone instead
611. More extensive unit tests for HTMLDefinition
612. assertPurification moved to central harness
613. HTMLPurifier_Generator accepts $config and $context parameters during
614  instantiation, not runtime
615. Double-quotes outside of attribute values are now unescaped
616
6173.1.0rc1, released 2008-04-22
618# Autoload support added. Internal require_once's removed in favor of an
619  explicit require list or autoloading. To use HTML Purifier,
620  you must now either use HTMLPurifier.auto.php
621  or HTMLPurifier.includes.php; setting the include path and including
622  HTMLPurifier.php is insufficient--in such cases include HTMLPurifier.autoload.php
623  as well to register our autoload handler (or modify your autoload function
624  to check HTMLPurifier_Bootstrap::getPath($class)). You can also use
625  HTMLPurifier.safe-includes.php for a less performance friendly but more
626  user-friendly library load.
627# HTMLPurifier_ConfigSchema static functions are officially deprecated. Schema
628  information is stored in the ConfigSchema directory, and the
629  maintenance/generate-schema-cache.php generates the schema.ser file, which
630  is now instantiated. Support for userland schema changes coming soon!
631# HTMLPurifier_Config will now throw E_USER_NOTICE when you use a directive
632  alias; to get rid of these errors just modify your configuration to use
633  the new directive name.
634# HTMLPurifier->addFilter is deprecated; built-in filters can now be
635  enabled using %Filter.$filter_name or by setting your own filters using
636  %Filter.Custom
637# Directive-level safety properties superceded in favor of module-level
638  safety. Internal method HTMLModule->addElement() has changed, although
639  the externally visible HTMLDefinition->addElement has *not* changed.
640! Extra utility classes for testing and non-library operations can
641  be found in extras/. Specifically, these are FSTools and ConfigDoc.
642  You may find a use for these in your own project, but right now they
643  are highly experimental and volatile.
644! Integration with PHPT allows for automated smoketests
645! Limited support for proprietary HTML elements, namely <marquee>, sponsored
646  by Chris. You can enable them with %HTML.Proprietary if your client
647  demands them.
648! Support for !important CSS cascade modifier. By default, this will be stripped
649  from CSS, but you can enable it using %CSS.AllowImportant
650! Support for display and visibility CSS properties added, set %CSS.AllowTricky
651  to true to use them.
652! HTML Purifier now has its own Exception hierarchy under HTMLPurifier_Exception.
653  Developer error (not enduser error) can cause these to be triggered.
654! Experimental kses() wrapper introduced with HTMLPurifier.kses.php
655! Finally %CSS.AllowedProperties for tweaking allowed CSS properties without
656  mucking around with HTMLPurifier_CSSDefinition
657! ConfigDoc output has been enhanced with version and deprecation info.
658! %HTML.ForbiddenAttributes and %HTML.ForbiddenElements implemented.
659- Autoclose now operates iteratively, i.e. <span><span><div> now has
660  both span tags closed.
661- Various HTMLPurifier_Config convenience functions now accept another parameter
662  $schema which defines what HTMLPurifier_ConfigSchema to use besides the
663  global default.
664- Fix bug with trusted script handling in libxml versions later than 2.6.28.
665- Fix bug in ExtractStyleBlocks with comments in style tags
666- Fix bug in comment parsing for DirectLex
667- Flush output now displayed when in command line mode for unit tester
668- Fix bug with rgb(0, 1, 2) color syntax with spaces inside shorthand syntax
669- HTMLPurifier_HTMLDefinition->addAttribute can now be called multiple times
670  on the same element without emitting errors.
671- Fixed fatal error in PH5P lexer with invalid tag names
672. Plugins now get their own changelogs according to project conventions.
673. Convert tokens to use instanceof, reducing memory footprint and
674  improving comparison speed.
675. Dry runs now supported in SimpleTest; testing facilities improved
676. Bootstrap class added for handling autoloading functionality
677. Implemented recursive glob at FSTools->globr
678. ConfigSchema now has instance methods for all corresponding define*
679  static methods.
680. A couple of new historical maintenance scripts were added.
681. HTMLPurifier/HTMLModule/Tidy/XHTMLAndHTML4.php split into two files
682. tests/index.php can now be run from any directory.
683. HTMLPurifier_Token subclasses split into seperate files
684. HTMLPURIFIER_PREFIX now is defined in Bootstrap.php, NOT HTMLPurifier.php
685. HTMLPURIFIER_PREFIX can now be defined outside of HTML Purifier
686. New --php=php flag added, allows PHP executable to be specified (command
687  line only!)
688. htmlpurifier_add_test() preferred method to translate test files in to
689  classes, because it handles PHPT files too.
690. Debugger class is deprecated and will be removed soon.
691. Command line argument parsing for testing scripts revamped, now --opt value
692  format is supported.
693. Smoketests now cleanup after magic quotes
694. Generator now can output comments (however, comments are still stripped
695  from HTML Purifier output)
696. HTMLPurifier_ConfigSchema->validate() deprecated in favor of
697  HTMLPurifier_VarParser->parse()
698. Integers auto-cast into float type by VarParser.
699. HTMLPURIFIER_STRICT removed; no validation is performed on runtime, only
700  during cache generation
701. Reordered script calls in maintenance/flush.php
702. Command line scripts now honor exit codes
703. When --flush fails in unit testers, abort tests and print message
704. Improved documentation in docs/dev-flush.html about the maintenance scripts
705. copy() methods removed in favor of clone keyword
706
7073.0.0, released 2008-01-06
708# HTML Purifier is PHP 5 only! The 2.1.x branch will be maintained
709  until PHP 4 is completely deprecated, but no new features will be added
710  to it.
711  + Visibility declarations added
712  + Constructor methods renamed to __construct()
713  + PHP4 reference cruft removed (in progress)
714! CSS properties are now case-insensitive
715! DefinitionCacheFactory now can register new implementations
716! New HTMLPurifier_Filter_ExtractStyleBlocks for extracting <style> from
717  documents and cleaning their contents up. Requires the CSSTidy library
718  <http://csstidy.sourceforge.net/>. You can access the blocks with the
719  'StyleBlocks' Context variable ($purifier->context->get('StyleBlocks')).
720  The output CSS can also be "scoped" for a specific element, use:
721  %Filter.ExtractStyleBlocksScope
722! Experimental support for some proprietary CSS attributes allowed:
723  opacity (and all of the browser-specific equivalents) and scrollbar colors.
724  Enable by setting %CSS.Proprietary to true.
725- Colors missing # but in hex form will be corrected
726- CSS Number algorithm improved
727- Unit testing and multi-testing now on steroids: command lines,
728  XML output, and other goodies now added.
729. Unit tests for Injector improved
730. New classes:
731  + HTMLPurifier_AttrDef_CSS_AlphaValue
732  + HTMLPurifier_AttrDef_CSS_Filter
733. Multitest now has a file docblock
734
7352.1.3, released 2007-11-05
736! tests/multitest.php allows you to test multiple versions by running
737  tests/index.php through multiple interpreters using `phpv` shell
738  script (you must provide this script!)
739- Fixed poor include ordering for Email URI AttrDefs, causes fatal errors
740  on some systems.
741- Injector algorithm further refined: off-by-one error regarding skip
742  counts for dormant injectors fixed
743- Corrective blockquote definition now enabled for HTML 4.01 Strict
744- Fatal error when <img> tag (or any other element with required attributes)
745  has 'id' attribute fixed, thanks NykO18 for reporting
746- Fix warning emitted when a non-supported URI scheme is passed to the
747  MakeAbsolute URIFilter, thanks NykO18 (again)
748- Further refine AutoParagraph injector. Behavior inside of elements
749  allowing paragraph tags clarified: only inline content delimeted by
750  double newlines (not block elements) are paragraphed.
751- Buggy treatment of end tags of elements that have required attributes
752  fixed (does not manifest on default tag-set)
753- Spurious internal content reorganization error suppressed
754- HTMLDefinition->addElement now returns a reference to the created
755  element object, as implied by the documentation
756- Phorum mod's HTML Purifier help message expanded (unreleased elsewhere)
757- Fix a theoretical class of infinite loops from DirectLex reported
758  by Nate Abele
759- Work around unnecessary DOMElement type-cast in PH5P that caused errors
760  in PHP 5.1
761- Work around PHP 4 SimpleTest lack-of-error complaining for one-time-only
762  HTMLDefinition errors, this may indicate problems with error-collecting
763  facilities in PHP 5
764- Make ErrorCollectorEMock work in both PHP 4 and PHP 5
765- Make PH5P work with PHP 5.0 by removing unnecessary array parameter typedef
766. %Core.AcceptFullDocuments renamed to %Core.ConvertDocumentToFragment
767  to better communicate its purpose
768. Error unit tests can now specify the expectation of no errors. Future
769  iterations of the harness will be extremely strict about what errors
770  are allowed
771. Extend Injector hooks to allow for more powerful injector routines
772. HTMLDefinition->addBlankElement created, as according to the HTMLModule
773  method
774. Doxygen configuration file updated, with minor improvements
775. Test runner now checks for similarly named files in conf/ directory too.
776. Minor cosmetic change to flush-definition-cache.php: trailing newline is
777  outputted
778. Maintenance script for generating PH5P patch added, original PH5P source
779  file also added under version control
780. Full unit test runner script title made more descriptive with PHP version
781. Updated INSTALL file to state that 4.3.7 is the earliest version we
782  are actively testing
783
7842.1.2, released 2007-09-03
785! Implemented Object module for trusted users
786! Implemented experimental HTML5 parsing mode using PH5P. To use, add
787  this to your code:
788        require_once 'HTMLPurifier/Lexer/PH5P.php';
789        $config->set('Core', 'LexerImpl', 'PH5P');
790  Note that this Lexer introduces some classes not in the HTMLPurifier
791  namespace.  Also, this is PHP5 only.
792! CSS property border-spacing implemented
793- Fix non-visible parsing error in DirectLex with empty tags that have
794  slashes inside attribute values.
795- Fix typo in CSS definition: border-collapse:seperate; was incorrectly
796  accepted as valid CSS. Usually non-visible, because this styling is the
797  default for tables in most browsers. Thanks Brett Zamir for pointing
798  this out.
799- Fix validation errors in configuration form
800- Hammer out a bunch of edge-case bugs in the standalone distribution
801- Inclusion reflection removed from URISchemeRegistry; you must manually
802  include any new schema files you wish to use
803- Numerous typo fixes in documentation thanks to Brett Zamir
804. Unit test refactoring for one logical test per test function
805. Config and context parameters in ComplexHarness deprecated: instead, edit
806  the $config and $context member variables
807. HTML wrapper in DOMLex now takes DTD identifiers into account; doesn't
808  really make a difference, but is good for completeness sake
809. merge-library.php script refactored for greater code reusability and
810  PHP4 compatibility
811
8122.1.1, released 2007-08-04
813- Fix show-stopper bug in %URI.MakeAbsolute functionality
814- Fix PHP4 syntax error in standalone version
815. Add prefix directory to include path for standalone, this prevents
816  other installations from clobbering the standalone's URI schemes
817. Single test methods can be invoked by prefixing with __only
818
8192.1.0, released 2007-08-02
820# flush-htmldefinition-cache.php superseded in favor of a generic
821  flush-definition-cache.php script, you can clear a specific cache
822  by passing its name as a parameter to the script
823! Phorum mod implemented for HTML Purifier
824! With %Core.AggressivelyFixLt, <3 and similar emoticons no longer
825  trigger HTML removal in PHP5 (DOMLex). This directive is not necessary
826  for PHP4 (DirectLex).
827! Standalone file now available, which greatly reduces the amount of
828  includes (although there are still a few files that reside in the
829  standalone folder)
830! Relative URIs can now be transformed into their absolute equivalents
831  using %URI.Base and %URI.MakeAbsolute
832! Ruby implemented for XHTML 1.1
833! You can now define custom URI filtering behavior, see enduser-uri-filter.html
834  for more details
835! UTF-8 font names now supported in CSS
836- AutoFormatters emit friendly error messages if tags or attributes they
837  need are not allowed
838- ConfigForm's compactification of directive names is now configurable
839- AutoParagraph autoformatter algorithm refined after field-testing
840- XHTML 1.1 now applies XHTML 1.0 Strict cleanup routines, namely
841  blockquote wrapping
842- Contents of <style> tags removed by default when tags are removed
843. HTMLPurifier_Config->getSerial() implemented, this is extremely useful
844  for output cache invalidation
845. ConfigForm printer now can retrieve CSS and JS files as strings, in
846  case HTML Purifier's directory is not publically accessible
847. Introduce new text/itext configuration directive values: these represent
848  longer strings that would be more appropriately edited with a textarea
849. Allow newlines to act as separators for lists, hashes, lookups and
850  %HTML.Allowed
851. ConfigForm generates textareas instead of text inputs for lists, hashes,
852  lookups, text and itext fields
853. Hidden element content removal genericized: %Core.HiddenElements can
854  be used to customize this behavior, by default <script> and <style> are
855  hidden
856. Added HTMLPURIFIER_PREFIX constant, should be used instead of dirname(__FILE__)
857. Custom ChildDef added to default include list
858. URIScheme reflection improved: will not attempt to include file if class
859  already exists. May clobber autoload, so I need to keep an eye on it
860. ConfigSchema heavily optimized, will only collect information and validate
861  definitions when HTMLPURIFIER_SCHEMA_STRICT is true.
862. AttrDef_URI unit tests and implementation refactored
863. benchmarks/ directory now protected from public view with .htaccess file;
864  run the tests via command line
865. URI scheme is munged off if there is no authority and the scheme is the
866  default one
867. All unit tests inherit from HTMLPurifier_Harness, not UnitTestCase
868. Interface for URIScheme changed
869. Generic URI object to hold components of URI added, most systems involved
870  in URI validation have been migrated to use it
871. Custom filtering for URIs factored out to URIDefinition interface for
872  maximum extensibility
873
8742.0.1, released 2007-06-27
875! Tag auto-closing now based on a ChildDef heuristic rather than a
876  manually set auto_close array; some behavior may change
877! Experimental AutoFormat functionality added: auto-paragraph and
878  linkify your HTML input by setting %AutoFormat.AutoParagraph and
879  %AutoFormat.Linkify to true
880! Newlines normalized internally, and then converted back to the
881  value of PHP_EOL. If this is not desired, set your newline format
882  using %Output.Newline.
883! Beta error collection, messages are implemented for the most generic
884  cases involving Lexing or Strategies
885- Clean up special case code for <script> tags
886- Reorder includes for DefinitionCache decorators, fixes a possible
887  missing class error
888- Fixed bug where manually modified definitions were not saved via cache
889  (mostly harmless, except for the fact that it would be a little slower)
890- Configuration objects with different serials do not clobber each
891  others when revision numbers are unequal
892- Improve Serializer DefinitionCache directory permissions checks
893- DefinitionCache no longer throws errors when it encounters old
894  serial files that do not conform to the current style
895- Stray xmlns attributes removed from configuration documentation
896- configForm.php smoketest no longer has XSS vulnerability due to
897  unescaped print_r output
898- Printer adheres to configuration's directives on output format
899- Fix improperly named form field in ConfigForm printer
900. Rewire some test-cases to swallow errors rather than expect them
901. HTMLDefinition printer updated with some of the new attributes
902. DefinitionCache keys reordered to reflect precedence: version number,
903  hash, then revision number
904. %Core.DefinitionCache renamed to %Cache.DefinitionImpl
905. Interlinking in configuration documentation added using
906  Injector_PurifierLinkify
907. Directives now keep track of aliases to themselves
908. Error collector now requires a severity to be passed, use PHP's internal
909  error constants for this
910. HTMLPurifier_Config::getAllowedDirectivesForForm implemented, allows
911  much easier selective embedding of configuration values
912. Doctype objects now accept public and system DTD identifiers
913. %HTML.Doctype is now constrained by specific values, to specify a custom
914  doctype use new %HTML.CustomDoctype
915. ConfigForm truncates long directives to keep the form small, and does
916  not re-output namespaces
917
9182.0.0, released 2007-06-20
919# Completely refactored HTMLModuleManager, decentralizing safety
920  information
921# Transform modules changed to Tidy modules, which offer more flexibility
922  and better modularization
923# Configuration object now finalizes itself when a read operation is
924  performed on it, ensuring that its internal state stays consistent.
925  To revert this behavior, you can set the $autoFinalize member variable
926  off, but it's not recommended.
927# New compact syntax for AttrDef objects that can be used to instantiate
928  new objects via make()
929# Definitions (esp. HTMLDefinition) are now cached for a significant
930  performance boost. You can disable caching by setting %Core.DefinitionCache
931  to null. You CANNOT edit raw definitions without setting the corresponding
932  DefinitionID directive (%HTML.DefinitionID for HTMLDefinition).
933# Contents between <script> tags are now completely removed if <script>
934  is not allowed
935# Prototype-declarations for Lexer removed in favor of configuration
936  determination of Lexer implementations.
937! HTML Purifier now works in PHP 4.3.2.
938! Configuration form-editing API makes tweaking HTMLPurifier_Config a
939  breeze!
940! Configuration directives that accept hashes now allow new string
941  format: key1:value1,key2:value2
942! ConfigDoc now factored into OOP design
943! All deprecated elements now natively supported
944! Implement TinyMCE styled whitelist specification format in
945  %HTML.Allowed
946! Config object gives more friendly error messages when things go wrong
947! Advanced API implemented: easy functions for creating elements (addElement)
948  and attributes (addAttribute) on HTMLDefinition
949! Add native support for required attributes
950- Deprecated and removed EnableRedundantUTF8Cleaning. It didn't even work!
951- DOMLex will not emit errors when a custom error handler that does not
952  honor error_reporting is used
953- StrictBlockquote child definition refrains from wrapping whitespace
954  in tags now.
955- Bug resulting from tag transforms to non-allowed elements fixed
956- ChildDef_Custom's regex generation has been improved, removing several
957  false positives
958. Unit test for ElementDef created, ElementDef behavior modified to
959  be more flexible
960. Added convenience functions for HTMLModule constructors
961. AttrTypes now has accessor functions that should be used instead
962  of directly manipulating info
963. TagTransform_Center deprecated in favor of generic TagTransform_Simple
964. Add extra protection in AttrDef_URI against phantom Schemes
965. Doctype object added to HTMLDefinition which describes certain aspects
966  of the operational document type
967. Lexer is now pre-emptively included, with a conditional include for the
968  PHP5 only version.
969. HTMLDefinition and CSSDefinition have a common parent class: Definition.
970. DirectLex can now track line-numbers
971. Preliminary error collector is in place, although no code actually reports
972  errors yet
973. Factor out most of ValidateAttributes to new AttrValidator class
974
9751.6.1, released 2007-05-05
976! Support for more deprecated attributes via transformations:
977  + hspace and vspace in img
978  + size and noshade in hr
979  + nowrap in td
980  + clear in br
981  + align in caption, table, img and hr
982  + type in ul, ol and li
983! DirectLex now preserves text in which a < bracket is followed by
984  a non-alphanumeric character. This means that certain emoticons
985  are now preserved.
986! %Core.RemoveInvalidImg is now operational, when set to false invalid
987  images will hang around with an empty src
988! target attribute in a tag supported, use %Attr.AllowedFrameTargets
989  to enable
990! CSS property white-space now allows nowrap (supported in all modern
991  browsers) but not others (which have spotty browser implementations)
992! XHTML 1.1 mode now sort-of works without any fatal errors, and
993  lang is now moved over to xml:lang.
994! Attribute transformation smoketest available at smoketests/attrTransform.php
995! Transformation of font's size attribute now handles super-large numbers
996- Possibly fatal bug with __autoload() fixed in module manager
997- Invert HTMLModuleManager->addModule() processing order to check
998  prefixes first and then the literal module
999- Empty strings get converted to empty arrays instead of arrays with
1000  an empty string in them.
1001- Merging in attribute lists now works.
1002. Demo script removed: it has been added to the website's repository
1003. Basic.php script modified to work out of the box
1004. Refactor AttrTransform classes to reduce duplication
1005. AttrTransform_TextAlign axed in favor of a more general
1006  AttrTransform_EnumToCSS, refer to HTMLModule/TransformToStrict.php to
1007  see how the new equivalent is implemented
1008. Unit tests now use exclusively assertIdentical
1009
10101.6.0, released 2007-04-01
1011! Support for most common deprecated attributes via transformations:
1012  + bgcolor in td, th, tr and table
1013  + border in img
1014  + name in a and img
1015  + width in td, th and hr
1016  + height in td, th
1017! Support for CSS attribute 'height' added
1018! Support for rel and rev attributes in a tags added, use %Attr.AllowedRel
1019  and %Attr.AllowedRev to activate
1020- You can define ID blacklists using regular expressions via
1021  %Attr.IDBlacklistRegexp
1022- Error messages are emitted when you attempt to "allow" elements or
1023  attributes that HTML Purifier does not support
1024- Fix segfault in unit test. The problem is not very reproduceable and
1025  I don't know what causes it, but a six line patch fixed it.
1026
10271.5.0, released 2007-03-23
1028! Added a rudimentary I18N and L10N system modeled off MediaWiki. It
1029  doesn't actually do anything yet, but keep your eyes peeled.
1030! docs/enduser-utf8.html explains how to use UTF-8 and HTML Purifier
1031! Newly structured HTMLDefinition modeled off of XHTML 1.1 modules.
1032  I am loathe to release beta quality APIs, but this is exactly that;
1033  don't use the internal interfaces if you're not willing to do migration
1034  later on.
1035- Allow 'x' subtag in language codes
1036- Fixed buggy chameleon-support for ins and del
1037. Added support for IDREF attributes (i.e. for)
1038. Renamed HTMLPurifier_AttrDef_Class to HTMLPurifier_AttrDef_Nmtokens
1039. Removed context variable ParentType, replaced with IsInline, which
1040  is false when you're not inline and an integer of the parent that
1041  caused you to become inline when you are (so possibly zero)
1042. Removed ElementDef->type in favor of ElementDef->descendants_are_inline
1043  and HTMLDefinition->content_sets
1044. StrictBlockquote now reports what elements its supposed to allow,
1045  rather than what it does allow
1046. Removed HTMLDefinition->info_flow_elements in favor of
1047  HTMLDefinition->content_sets['Flow']
1048. Removed redundant "exclusionary" definitions from DTD roster
1049. StrictBlockquote now requires a construction parameter as if it
1050  were an Required ChildDef, this is the "real" set of allowed elements
1051. AttrDef partitioned into HTML, CSS and URI segments
1052. Modify Youtube filter regexp to be multiline
1053. Require both PHP5 and DOM extension in order to use DOMLex, fixes
1054  some edge cases where a DOMDocument class exists in a PHP4 environment
1055  due to DOM XML extension.
1056
10571.4.1, released 2007-01-21
1058! docs/enduser-youtube.html updated according to new functionality
1059- YouTube IDs can have underscores and dashes
1060
10611.4.0, released 2007-01-21
1062! Implemented list-style-image, URIs now allowed in list-style
1063! Implemented background-image, background-repeat, background-attachment
1064  and background-position CSS properties. Shorthand property background
1065  supports all of these properties.
1066! Configuration documentation looks nicer
1067! Added %Core.EscapeNonASCIICharacters to workaround loss of Unicode
1068  characters while %Core.Encoding is set to a non-UTF-8 encoding.
1069! Support for configuration directive aliases added
1070! Config object can now be instantiated from ini files
1071! YouTube preservation code added to the core, with two lines of code
1072  you can add it as a filter to your code. See smoketests/preserveYouTube.php
1073  for sample code.
1074! Moved SLOW to docs/enduser-slow.html and added code examples
1075- Replaced version check with functionality check for DOM (thanks Stephen
1076  Khoo)
1077. Added smoketest 'all.php', which loads all other smoketests via frames
1078. Implemented AttrDef_CSSURI for url(http://google.com) style declarations
1079. Added convenient single test selector form on test runner
1080
10811.3.2, released 2006-12-25
1082! HTMLPurifier object now accepts configuration arrays, no need to manually
1083  instantiate a configuration object
1084! Context object now accessible to outside
1085! Added enduser-youtube.html, explains how to embed YouTube videos. See
1086  also corresponding smoketest preserveYouTube.php.
1087! Added purifyArray(), which takes a list of HTML and purifies it all
1088! Added static member variable $version to HTML Purifier with PHP-compatible
1089  version number string.
1090- Fixed fatal error thrown by upper-cased language attributes
1091- printDefinition.php: added labels, added better clarification
1092. HTMLPurifier_Config::create() added, takes mixed variable and converts into
1093  a HTMLPurifier_Config object.
1094
10951.3.1, released 2006-12-06
1096! Added HTMLPurifier.func.php stub for a convenient function to call the library
1097- Fixed bug in RemoveInvalidImg code that caused all images to be dropped
1098  (thanks to .mario for reporting this)
1099. Standardized all attribute handling variables to attr, made it plural
1100
11011.3.0, released 2006-11-26
1102# Invalid images are now removed, rather than replaced with a dud
1103  <img src="" alt="Invalid image" />. Previous behavior can be restored
1104  with new directive %Core.RemoveInvalidImg set to false.
1105! (X)HTML Strict now supported
1106  + Transparently handles inline elements in block context (blockquote)
1107! Added GET method to demo for easier validation, added 50kb max input size
1108! New directive %HTML.BlockWrapper, for block-ifying inline elements
1109! New directive %HTML.Parent, allows you to only allow inline content
1110! New directives %HTML.AllowedElements and %HTML.AllowedAttributes to let
1111  users narrow the set of allowed tags
1112! <li value="4"> and <ul start="2"> now allowed in loose mode
1113! New directives %URI.DisableExternalResources and %URI.DisableResources
1114! New directive %Attr.DisableURI, which eliminates all hyperlinking
1115! New directive %URI.Munge, munges URI so you can use some sort of redirector
1116  service to avoid PageRank leaks or warn users that they are exiting your site.
1117! Added spiffy new smoketest printDefinition.php, which lets you twiddle with
1118  the configuration settings and see how the internal rules are affected.
1119! New directive %URI.HostBlacklist for blocking links to bad hosts.
1120  xssAttacks.php smoketest updated accordingly.
1121- Added missing type to ChildDef_Chameleon
1122- Remove Tidy option from demo if there is not Tidy available
1123. ChildDef_Required guards against empty tags
1124. Lookup table HTMLDefinition->info_flow_elements added
1125. Added peace-of-mind variable initialization to Strategy_FixNesting
1126. Added HTMLPurifier->info_parent_def, parent child processing made special
1127. Added internal documents briefly summarizing future progression of HTML
1128. HTMLPurifier_Config->getBatch($namespace) added
1129. More lenient casting to bool from string in HTMLPurifier_ConfigSchema
1130. Refactored ChildDef classes into their own files
1131
11321.2.0, released 2006-11-19
1133# ID attributes now disabled by default. New directives:
1134  + %HTML.EnableAttrID - restores old behavior by allowing IDs
1135  + %Attr.IDPrefix - %Attr.IDBlacklist alternative that munges all user IDs
1136    so that they don't collide with your IDs
1137  + %Attr.IDPrefixLocal - Same as above, but for when there are multiple
1138    instances of user content on the page
1139  + Profuse documentation on how to use these available in docs/enduser-id.txt
1140! Added MODx plugin <http://modxcms.com/forums/index.php/topic,6604.0.html>
1141! Added percent encoding normalization
1142! XSS attacks smoketest given facelift
1143! Configuration documentation now has table of contents
1144! Added %URI.DisableExternal, which prevents links to external websites.  You
1145  can also use %URI.Host to permit absolute linking to subdomains
1146! Non-accessible resources (ex. mailto) blocked from embedded URIs (img src)
1147- Type variable in HTMLDefinition was not being set properly, fixed
1148- Documentation updated
1149  + TODO added request Phalanger
1150  + TODO added request Native compression
1151  + TODO added request Remove redundant tags
1152  + TODO added possible plaintext formatter for HTML Purifier documentation
1153  + Updated ConfigDoc TODO
1154  + Improved inline comments in AttrDef/Class.php, AttrDef/CSS.php
1155    and AttrDef/Host.php
1156  + Revamped documentation into HTML, along with misc updates
1157- HTMLPurifier_Context doesn't throw a variable reference error if you attempt
1158  to retrieve a non-existent variable
1159. Switched to purify()-wide Context object registry
1160. Refactored unit tests to minimize duplication
1161. XSS attack sheet updated
1162. configdoc.xml now has xml:space attached to default value nodes
1163. Allow configuration directives to permit null values
1164. Cleaned up test-cases to remove unnecessary swallowErrors()
1165
11661.1.2, released 2006-09-30
1167! Add HTMLPurifier.auto.php stub file that configures include_path
1168- Documentation updated
1169  + INSTALL document rewritten
1170  + TODO added semi-lossy conversion
1171  + API Doxygen docs' file exclusions updated
1172  + Added notes on HTML versus XML attribute whitespace handling
1173  + Noted that HTMLPurifier_ChildDef_Custom isn't being used
1174  + Noted that config object's definitions are cached versions
1175- Fixed lack of attribute parsing in HTMLPurifier_Lexer_PEARSax3
1176- ftp:// URIs now have their typecodes checked
1177- Hooked up HTMLPurifier_ChildDef_Custom's unit tests (they weren't being run)
1178. Line endings standardized throughout project (svn:eol-style standardized)
1179. Refactored parseData() to general Lexer class
1180. Tester named "HTML Purifier" not "HTMLPurifier"
1181
11821.1.1, released 2006-09-24
1183! Configuration option to optionally Tidy up output for indentation to make up
1184  for dropped whitespace by DOMLex (pretty-printing for the entire application
1185  should be done by a page-wide Tidy)
1186- Various documentation updates
1187- Fixed parse error in configuration documentation script
1188- Fixed fatal error in benchmark scripts, slightly augmented
1189- As far as possible, whitespace is preserved in-between table children
1190- Sample test-settings.php file included
1191
11921.1.0, released 2006-09-16
1193! Directive documentation generation using XSLT
1194! XHTML can now be turned off, output becomes <br>
1195- Made URI validator more forgiving: will ignore leading and trailing
1196  quotes, apostrophes and less than or greater than signs.
1197- Enforce alphanumeric namespace and directive names for configuration.
1198- Table child definition made more flexible, will fix up poorly ordered elements
1199. Renamed ConfigDef to ConfigSchema
1200
12011.0.1, released 2006-09-04
1202- Fixed slight bug in DOMLex attribute parsing
1203- Fixed rejection of case-insensitive configuration values when there is a
1204  set of allowed values.  This manifested in %Core.Encoding.
1205- Fixed rejection of inline style declarations that had lots of extra
1206  space in them.  This manifested in TinyMCE.
1207
12081.0.0, released 2006-09-01
1209! Shorthand CSS properties implemented: font, border, background, list-style
1210! Basic color keywords translated into hexadecimal values
1211! Table CSS properties implemented
1212! Support for charsets other than UTF-8 (defined by iconv)
1213! Malformed UTF-8 and non-SGML character detection and cleaning implemented
1214- Fixed broken numeric entity conversion
1215- API documentation completed
1216. (HTML|CSS)Definition de-singleton-ized
1217
12181.0.0beta, released 2006-08-16
1219! First public release, most functionality implemented. Notable omissions are:
1220  + Shorthand CSS properties
1221  + Table CSS properties
1222  + Deprecated attribute transformations
1223
1224    vim: et sw=4 sts=4
1225