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-NEWS ( CHANGELOG and HISTORY )                                     HTMLPurifier
-|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
-
-= KEY ====================
-    # Breaks back-compat
-    ! Feature
-    - Bugfix
-      + Sub-comment
-    . Internal change
-==========================
-
-4.12.0, released 2019-10-27
-! PHP 7.4 is supported, thank you Witold Wasiczko, Mateuz Turcza and
-  Edi Modrić
-- PHPDocs for HTMLModule::addElement() and Bool attr are fixed (thanks
-  Mateusz)
-
-4.11.0, released 2019-07-14
-# SafeScripting now matches case-sensitively against its whitelist (previously it was
-  case-insensitive.)  Thanks Dimitri Gritsajuk <gritsajuk.dimitri@gmail.com>
-  for reporting.
-! New directive %Core.AllowParseManyTags which allows parsing of many nested tags.
-  Thanks M. Suzuki <msuzuki1986@gmail.com> for contributing the patch.
-! purifyArray now supports multidimensional arrays.  Thanks
-  Sandro Miguel Marques <sandromiguel@sandromiguel.com> for contributing this patch.
-! initial and inherit settings available for width, height, and the min-/max-
-  versions thereof.  Thanks Michael Kliewe <info@phpgansta.de> for contributing
-  this patch.
-! More color names are supported.  Thanks Daijobou for contributing.
-- Compatibility fixes for PHP 7.3, including new CI for PHP 7.3
-  (thank you Lukas Neumann <lksnmnn@gmail.com>) and removal of
-  reserved words in our constants (thanks Darko Hrgovic <darko@darkodev.com>
-- Compatibility fixes for HHVM.  Thanks Mateusz Turcza for contributing
-  this fix.
-- HTML Purifier now never defines __autoload, fixing #196.  Thanks
-  Michael Kliewe for reporting.
-- In some situations, Config.php would report an undefined index: class
-  error; this has been fixed.  Thanks DiLong Fa for contributing
-  this fix.
-- We no longer produce <script /> tags; we always explicitly write
-  out the open and close tag.  Thanks Dimitri Gritsajuk
-  <gritsajuk.dimitri@gmail.com> for contributing this fix.
-- Better compatibility when IDNA constants are not present.  Thanks
-  Mateusz Turcza <xemlock@gmail.com> for contributing this fix.
-
-4.10.0, released 2018-02-22
-# PHP 5.3 is no longer officially supported by HTML Purifier
-  (we did not specifically break support, but we are no longer
-  testing on PHP 5.3)
-! Relative CSS length units are now supported
-- A few PHP 7.2 compatibility fixes, thanks John Flatness
-  <john@zerocrates.org>
-- Improve portability with old versions of libxml which don't
-  support accessing the data of a node
-- IDNA2008 is now used for converting domains to ASCII, fixing
-  some rather strange bugs with international domains
-- Fix race condition resulting in E_WARNING when creating
-  directories with Serializer
-
-4.9.3, released 2017-06-02
-- Workaround PHP 7.1 infinite loop when opcode cache is enabled.
-  Thanks @Xiphin (#134, #135)
-- Don't use autoloader when testing for DOMDocument.  Hypothetically,
-  this could cause your install to start using DirectLex if you had
-  previously been monkeypatching in a custom, autoloaded implementation
-  of DOMDocument.  Don't do that.  Thanks @Izumi-kun (#130)
-
-4.9.2, released 2017-03-12
-- Fixes PHP 5.3 compatibility
-- Fix breakage when decoding decimal entities.  Thanks @rybakit (#129)
-
-4.9.1, released 2017-03-08
-! %URI.DefaultScheme can now be set to null, in which case
-  all relative paths are removed.
-! New CSS properties: min-width, max-width, min-height, max-height (#94)
-! Transparency (rgba) and hsl/hsla supported where color CSS is present.
-  Thanks @fxbt for contributing the patch. (#118)
-- When idn_to_ascii is defined, we might accept malformed
-  hostnames.  Apply validation to the result in such cases.
-- Close directory when done in Serializer DefinitionCache (#100)
-- Deleted some asserts to avoid linters from choking (#97)
-- Rework Serializer cache behavior to avoid chmod'ing if possible (#32)
-- Embedded semicolons in strings in CSS are now handled correctly!
-- We accidentally dropped certain Unicode characters if there was
-  one or more invalid characters.  This has been fixed, thanks
-  to mpyw <ryosuke_i_628@yahoo.co.jp>
-- Fix for "Don't truncate upon encountering </div> when using DOMLex"
-  caused a regression with HTML 4.01 Strict parsing with libxml 2.9.1
-  (and maybe later versions, but known OK with libxml 2.9.4).  The
-  fix is to go about handling truncation a bit more cleverly so that
-  we can wrap with divs (sidestepping the bug) but slurping out the
-  rest of the text in case it ran off the end.  (#78)
-- Fix PREG_BACKTRACK_LIMIT_ERROR in HTMLPurifier_Filter_ExtractStyle.
-  Thanks @breathbath for contributing the report and fix (#120)
-- Fix entity decoding algorithm to be more conservative about
-  decoding entities that are missing trailing semicolon.
-  To get old behavior, set %Core.LegacyEntityDecoder to true.
-  (#119)
-- Workaround libxml bug when HTML tags are embedded inside
-  script tags.  To disable workaround set %Core.AggressivelyRemoveScript
-  to false. (#83)
-# By default, when a link has a target attribute associated
-  with it, we now also add rel="noopener" in order to
-  prevent the new window from being able to overwrite
-  the original frame.  To disable this protection,
-  set %HTML.TargetNoopener to FALSE.
-
-4.9.0 was cut on Git but never properly released; when we did the
-real release we decided to skip this version number.
-
-4.8.0, released 2016-07-16
-# By default, when a link has a target attribute associated
-  with it, we now also add rel="noreferrer" in order to
-  prevent the new window from being able to overwrite
-  the original frame.  To disable this protection,
-  set %HTML.TargetNoreferrer to FALSE.
-! Full PHP 7 compatibility, the test suite is ALL GO.
-! %CSS.AllowDuplicates permits duplicate CSS properties.
-! Support for 'tel' URIs.
-! Partial support for 'border-radius' properties when %CSS.AllowProprietary is true.
-  The slash syntax, i.e., 'border-radius: 2em 1em 4em / 0.5em 3em' is not
-  yet supported.
-! %Attr.ID.HTML5 turns on HTML5-style ID handling.
-- alt truncation could result in malformed UTF-8 sequence. Don't
-  truncate.  Thanks Brandon Farber for reporting.
-- Linkify regex is smarter, based off of Gruber's regex.
-- IDNA supported natively on PHP 5.3 and later.
-- Non all-numeric top-level names (e.g., foo.1f, 1f) are now
-  allowed.
-- Minor bounds error fix to squash a PHP 7 notice.
-- Support non-/tmp temporary directories for data:// validation
-- Give a better error message when a user attempts to allow
-  ul/ol without allowing li.
-- On some versions of PHP, the Serializer DefinitionCache could
-  infinite loop when the directory exists but is not listable. (#49)
-- Don't match for <body> inside comments with
-  %Core.ConvertDocumentToFragment. (#67)
-- SafeObject is now less case sensitive. (#57)
-- AutoFormat.RemoveEmpty.Predicate now correctly renders in
-  web form. (#85)
-
-4.7.0, released 2015-08-04
-# opacity is now considered a "tricky" CSS property rather than a
-  proprietary one.
-! %AutoFormat.RemoveEmpty.Predicate for specifying exactly when
-  an element should be considered "empty" (maybe preserve if it
-  has attributes), and modify iframe support so that the iframe
-  is removed if it is missing a src attribute.  Thanks meeva for
-  reporting.
-- Don't truncate upon encountering </div> when using DOMLex.  Thanks
-  Myrto Christina for finally convincing me to fix this.
-- Update YouTube filter for new code.
-- Fix parsing of rgb() values with spaces in them for 'border'
-  attribute.
-- Don't remove foo="" attributes if foo is a boolean attribute.  Thanks
-  valME for reporting.
-
-4.6.0, released 2013-11-30
-# Secure URI munge hashing algorithm has changed to hash_hmac("sha256", $url, $secret).
-  Please update any verification scripts you may have.
-# URI parsing algorithm was made more strict, so only prefixes which
-  looks like schemes will actually be schemes.  Thanks
-  Michael Gusev <mgusev@sugarcrm.com> for fixing.
-# %Core.EscapeInvalidChildren is no longer supported, and no longer does
-  anything.
-! New directive %Core.AllowHostnameUnderscore which allows underscores
-  in hostnames.
-- Eliminate quadratic behavior in DOMLex by using a proper queue.
-  Thanks Ole Laursen for noticing this.
-- Rewritten MakeWellFormed/FixNesting implementation eliminates quadratic
-  behavior in the rest of the purificaiton pipeline.  Thanks Chedburn
-  Networks for sponsoring this work.
-- Made Linkify URL parser a bit less permissive, so that non-breaking
-  spaces and commas are not included as part of URL.  Thanks nAS for fixing.
-- Fix some bad interactions with %HTML.Allowed and injectors.  Thanks
-  David Hirtz for reporting.
-- Fix infinite loop in DirectLex. Thanks Ashar Javed (@soaj1664ashar)
-  for reporting.
-
-4.5.0, released 2013-02-17
-# Fix bug where stacked attribute transforms clobber each other;
-  this also means it's no longer possible to override attribute
-  transforms in later modules.  No internal code was using this
-  but this may break some clients.
-# We now use SHA-1 to identify cached definitions, instead of MD5.
-! Support display:inline-block
-! Support for more white-space CSS values.
-! Permit underscores in font families
-! Support for page-break-* CSS3 properties when proprietary properties
-  are enabled.
-! New directive %Core.DisableExcludes; can be set to 'true' to turn off
-  SGML excludes checking.  If HTML Purifier is removing too much text
-  and you don't care about full standards compliance, try setting this to
-  'true'.
-- Use prepend for SPL autoloading on PHP 5.3 and later.
-- Fix bug with nofollow transform when pre-existing rel exists.
-- Fix bug where background:url() always gets lower-cased
-  (but not background-image:url())
-- Fix bug with non lower-case color names in HTML
-- Fix bug where data URI validation doesn't remove temporary files.
-  Thanks Javier Marín Ros <javiermarinros@gmail.com> for reporting.
-- Don't remove certain empty tags on RemoveEmpty.
-
-4.4.0, released 2012-01-18
-# Removed PEARSax3 handler.
-# URI.Munge now munges URIs inside the same host that go from https
-  to http.  Reported by Neike Taika-Tessaro.
-# Core.EscapeNonASCIICharacters now always transforms entities to
-  entities, even if target encoding is UTF-8.
-# Tighten up selector validation in ExtractStyleBlocks.
-  Non-syntactically valid selectors are now rejected, along with
-  some of the more obscure ones such as attribute selectors, the
-  :lang pseudoselector, and anything not in CSS2.1.  Furthermore,
-  ID and class selectors now work properly with the relevant
-  configuration attributes.  Also, mute errors when parsing CSS
-  with CSS Tidy.  Reported by Mario Heiderich and Norman Hippert.
-! Added support for 'scope' attribute on tables.
-! Added %HTML.TargetBlank, which adds target="blank" to all outgoing links.
-! Properly handle sub-lists directly nested inside of lists in
-  a standards compliant way, by moving them into the preceding <li>
-! Added %HTML.AllowedComments and %HTML.AllowedCommentsRegexp for
-  limited allowed comments in untrusted situations.
-! Implement iframes, and allow them to be used in untrusted mode with
-  %HTML.SafeIframe and %URI.SafeIframeRegexp.  Thanks Bradley M. Froehle
-  <brad.froehle@gmail.com> for submitting an initial version of the patch.
-! The Forms module now works properly for transitional doctypes.
-! Added support for internationalized domain names. You need the PEAR
-  Net_IDNA2 module to be in your path; if it is installed, ensure the
-  class can be loaded and then set %Core.EnableIDNA to true.
-- Color keywords are now case insensitive.  Thanks Yzmir Ramirez
-  <yramirez-htmlpurifier@adicio.com> for reporting.
-- Explicitly initialize anonModule variable to null.
-- Do not duplicate nofollow if already present.  Thanks 178
-  for reporting.
-- Do not add nofollow if hostname matches our current host.  Thanks 178
-  for reporting, and Neike Taika-Tessaro for helping diagnose.
-- Do not unset parser variable; this fixes intermittent serialization
-  problems.  Thanks Neike Taika-Tessaro for reporting, bill
-  <10010tiger@gmail.com> for diagnosing.
-- Fix iconv truncation bug, where non-UTF-8 target encodings see
-  output truncated after around 8000 characters.  Thanks Jörg Ludwig
-  <joerg.ludwig@iserv.eu> for reporting.
-- Fix broken table content model for XHTML1.1 (and also earlier
-  versions, although the W3C validator doesn't catch those violations).
-  Thanks GlitchMr <glitch.mr@gmail.com> for reporting.
-
-4.3.0, released 2011-03-27
-# Fixed broken caching of customized raw definitions, but requires an
-  API change.  The old API still works but will emit a warning,
-  see http://htmlpurifier.org/docs/enduser-customize.html#optimized
-  for how to upgrade your code.
-# Protect against Internet Explorer innerHTML behavior by specially
-  treating attributes with backticks but no angled brackets, quotes or
-  spaces.  This constitutes a slight semantic change, which can be
-  reverted using %Output.FixInnerHTML.  Reported by Neike Taika-Tessaro
-  and Mario Heiderich.
-# Protect against cssText/innerHTML by restricting allowed characters
-  used in fonts further than mandated by the specification and encoding
-  some extra special characters in URLs.  Reported by Neike
-  Taika-Tessaro and Mario Heiderich.
-! Added %HTML.Nofollow to add rel="nofollow" to external links.
-! More types of SPL autoloaders allowed on later versions of PHP.
-! Implementations for position, top, left, right, bottom, z-index
-  when %CSS.Trusted is on.
-! Add %Cache.SerializerPermissions option for custom serializer
-  directory/file permissions
-! Fix longstanding bug in Flash support for non-IE browsers, and
-  allow more wmode attributes.
-! Add %CSS.AllowedFonts to restrict permissible font names.
-- Switch to an iterative traversal of the DOM, which prevents us
-  from running out of stack space for deeply nested documents.
-  Thanks Maxim Krizhanovsky for contributing a patch.
-- Make removal of conditional IE comments ungreedy; thanks Bernd
-  for reporting.
-- Escape CDATA before removing Internet Explorer comments.
-- Fix removal of id attributes under certain conditions by ensuring
-  armor attributes are preserved when recreating tags.
-- Check if schema.ser was corrupted.
-- Check if zend.ze1_compatibility_mode is on, and error out if it is.
-  This safety check is only done for HTMLPurifier.auto.php; if you
-  are using standalone or the specialized includes files, you're
-  expected to know what you're doing.
-- Stop repeatedly writing the cache file after I'm done customizing a
-  raw definition.  Reported by ajh.
-- Switch to using require_once in the Bootstrap to work around bad
-  interaction with Zend Debugger and APC.  Reported by Antonio Parraga.
-- Fix URI handling when hostname is missing but scheme is present.
-  Reported by Neike Taika-Tessaro.
-- Fix missing numeric entities on DirectLex; thanks Neike Taika-Tessaro
-  for reporting.
-- Fix harmless notice from indexing into empty string.  Thanks Matthijs
-  Kooijman <matthijs@stdin.nl> for reporting.
-- Don't autoclose no parent elements are able to support the element
-  that triggered the autoclose.  In particular fixes strange behavior
-  of stray <li> tags.  Thanks pkuliga@gmail.com for reporting and
-  Neike Taika-Tessaro <pinkgothic@gmail.com> for debugging assistance.
-
-4.2.0, released 2010-09-15
-! Added %Core.RemoveProcessingInstructions, which lets you remove
-  <? ... ?> statements.
-! Added %URI.DisableResources functionality; the directive originally
-  did nothing.  Thanks David Rothstein for reporting.
-! Add documentation about configuration directive types.
-! Add %CSS.ForbiddenProperties configuration directive.
-! Add %HTML.FlashAllowFullScreen to permit embedded Flash objects
-  to utilize full-screen mode.
-! Add optional support for the <code>file</code> URI scheme, enable
-  by explicitly setting %URI.AllowedSchemes.
-! Add %Core.NormalizeNewlines options to allow turning off newline
-  normalization.
-- Fix improper handling of Internet Explorer conditional comments
-  by parser.  Thanks zmonteca for reporting.
-- Fix missing attributes bug when running on Mac Snow Leopard and APC.
-  Thanks sidepodcast for the fix.
-- Warn if an element is allowed, but an attribute it requires is
-  not allowed.
-
-4.1.1, released 2010-05-31
-- Fix undefined index warnings in maintenance scripts.
-- Fix bug in DirectLex for parsing elements with a single attribute
-  with entities.
-- Rewrite CSS output logic for font-family and url().  Thanks Mario
-  Heiderich <mario.heiderich@googlemail.com> for reporting and Takeshi
-  Terada <t-terada@violet.plala.or.jp> for suggesting the fix.
-- Emit an error for CollectErrors if a body is extracted
-- Fix bug where in background-position for center keyword handling.
-- Fix infinite loop when a wrapper element is inserted in a context
-  where it's not allowed.  Thanks Lars <lars@renoz.dk> for reporting.
-- Remove +x bit and shebang from index.php; only supported mode is to
-  explicitly call it with php.
-- Make test script less chatty when log_errors is on.
-
-4.1.0, released 2010-04-26
-! Support proprietary height attribute on table element
-! Support YouTube slideshows that contain /cp/ in their URL.
-! Support for data: URI scheme; not enabled by default, add it using
-  %URI.AllowedSchemes
-! Support flashvars when using %HTML.SafeObject and %HTML.SafeEmbed.
-! Support for Internet Explorer compatibility with %HTML.SafeObject
-  using %Output.FlashCompat.
-! Handle <ol><ol> properly, by inserting the necessary <li> tag.
-- Always quote the insides of url(...) in CSS.
-
-4.0.0, released 2009-07-07
-# APIs for ConfigSchema subsystem have substantially changed. See
-  docs/dev-config-bcbreaks.txt for details; in essence, anything that
-  had both namespace and directive now have a single unified key.
-# Some configuration directives were renamed, specifically:
-    %AutoFormatParam.PurifierLinkifyDocURL -> %AutoFormat.PurifierLinkify.DocURL
-    %FilterParam.ExtractStyleBlocksEscaping -> %Filter.ExtractStyleBlocks.Escaping
-    %FilterParam.ExtractStyleBlocksScope -> %Filter.ExtractStyleBlocks.Scope
-    %FilterParam.ExtractStyleBlocksTidyImpl -> %Filter.ExtractStyleBlocks.TidyImpl
-  As usual, the old directive names will still work, but will throw E_NOTICE
-  errors.
-# The allowed values for class have been relaxed to allow all of CDATA for
-  doctypes that are not XHTML 1.1 or XHTML 2.0.  For old behavior, set
-  %Attr.ClassUseCDATA to false.
-# Instead of appending the content model to an old content model, a blank
-  element will replace the old content model.  You can use #SUPER to get
-  the old content model.
-! More robust support for name="" and id=""
-! HTMLPurifier_Config::inherit($config) allows you to inherit one
-  configuration, and have changes to that configuration be propagated
-  to all of its children.
-! Implement %HTML.Attr.Name.UseCDATA, which relaxes validation rules on
-  the name attribute when set. Use with care. Thanks Ian Cook for
-  sponsoring.
-! Implement %AutoFormat.RemoveEmpty.RemoveNbsp, which removes empty
-  tags that contain non-breaking spaces as well other whitespace. You
-  can also modify which tags should have &nbsp; maintained with
-  %AutoFormat.RemoveEmpty.RemoveNbsp.Exceptions.
-! Implement %Attr.AllowedClasses, which allows administrators to restrict
-  classes users can use to a specified finite set of classes, and
-  %Attr.ForbiddenClasses, which is the logical inverse.
-! You can now maintain your own configuration schema directories by
-  creating a config-schema.php file or passing an extra argument. Check
-  docs/dev-config-schema.html for more details.
-! Added HTMLPurifier_Config->serialize() method, which lets you save away
-  your configuration in a compact serial file, which you can unserialize
-  and use directly without having to go through the overhead of setup.
-- Fix bug where URIDefinition would not get cleared if it's directives got
-  changed.
-- Fix fatal error in HTMLPurifier_Encoder on certain platforms (probably NetBSD 5.0)
-- Fix bug in Linkify autoformatter involving <a><span>http://foo</span></a>
-- Make %URI.Munge not apply to links that have the same host as your host.
-- Prevent stray </body> tag from truncating output, if a second </body>
-  is present.
-. Created script maintenance/rename-config.php for renaming a configuration
-  directive while maintaining its alias.  This script does not change source code.
-. Implement namespace locking for definition construction, to prevent
-  bugs where a directive is used for definition construction but is not
-  used to construct the cache hash.
-
-3.3.0, released 2009-02-16
-! Implement CSS property 'overflow' when %CSS.AllowTricky is true.
-! Implement generic property list classess
-- Fix bug with testEncodingSupportsASCII() algorithm when iconv() implementation
-  does not do the "right thing" with characters not supported in the output
-  set.
-- Spellcheck UTF-8: The Secret To Character Encoding
-- Fix improper removal of the contents of elements with only whitespace. Thanks
-  Eric Wald for reporting.
-- Fix broken test suite in versions of PHP without spl_autoload_register()
-- Fix degenerate case with YouTube filter involving double hyphens.
-  Thanks Pierre Attar for reporting.
-- Fix YouTube rendering problem on certain versions of Firefox.
-- Fix CSSDefinition Printer problems with decorators
-- Add text parameter to unit tests, forces text output
-. Add verbose mode to command line test runner, use (--verbose)
-. Turn on unit tests for UnitConverter
-. Fix missing version number in configuration %Attr.DefaultImageAlt (added 3.2.0)
-. Fix newline errors that caused spurious failures when CRLF HTML Purifier was
-  tested on Linux.
-. Removed trailing whitespace from all text files, see
-  remote-trailing-whitespace.php maintenance script.
-. Convert configuration to use property list backend.
-
-3.2.0, released 2008-10-31
-# Using %Core.CollectErrors forces line number/column tracking on, whereas
-  previously you could theoretically turn it off.
-# HTMLPurifier_Injector->notifyEnd() is formally deprecated. Please
-  use handleEnd() instead.
-! %Output.AttrSort for when you need your attributes in alphabetical order to
-  deal with a bug in FCKEditor. Requested by frank farmer.
-! Enable HTML comments when %HTML.Trusted is on. Requested by Waldo Jaquith.
-! Proper support for name attribute. It is now allowed and equivalent to the id
-  attribute in a and img tags, and is only converted to id when %HTML.TidyLevel
-  is heavy (for all doctypes).
-! %AutoFormat.RemoveEmpty to remove some empty tags from documents. Please don't
-  use on hand-written HTML.
-! Add error-cases for unsupported elements in MakeWellFormed. This enables
-  the strategy to be used, standalone, on untrusted input.
-! %Core.AggressivelyFixLt is on by default. This causes more sensible
-  processing of left angled brackets in smileys and other whatnot.
-! Test scripts now have a 'type' parameter, which lets you say 'htmlpurifier',
-  'phpt', 'vtest', etc. in order to only execute those tests. This supercedes
-  the --only-phpt parameter, although for backwards-compatibility the flag
-  will still work.
-! AutoParagraph auto-formatter will now preserve double-newlines upon output.
-  Users who are not performing inbound filtering, this may seem a little
-  useless, but as a bonus, the test suite and handling of edge cases is also
-  improved.
-! Experimental implementation of forms for %HTML.Trusted
-! Track column numbers when maintain line numbers is on
-! Proprietary 'background' attribute on table-related elements converted into
-  corresponding CSS.  Thanks Fusemail for sponsoring this feature!
-! Add forward(), forwardUntilEndToken(), backward() and current() to Injector
-  supertype.
-! HTMLPurifier_Injector->handleEnd() permits modification to end tokens. The
-  time of operation varies slightly from notifyEnd() as *all* end tokens are
-  processed by the injector before they are subject to the well-formedness rules.
-! %Attr.DefaultImageAlt allows overriding default behavior of setting alt to
-  basename of image when not present.
-! %AutoFormat.DisplayLinkURI neuters <a> tags into plain text URLs.
-- Fix two bugs in %URI.MakeAbsolute; one involving empty paths in base URLs,
-  the other involving an undefined $is_folder error.
-- Throw error when %Core.Encoding is set to a spurious value. Previously,
-  this errored silently and returned false.
-- Redirected stderr to stdout for flush error output.
-- %URI.DisableExternal will now use the host in %URI.Base if %URI.Host is not
-  available.
-- Do not re-munge URL if the output URL has the same host as the input URL.
-  Requested by Chris.
-- Fix error in documentation regarding %Filter.ExtractStyleBlocks
-- Prevent <![CDATA[<body></body>]]> from triggering %Core.ConvertDocumentToFragment
-- Fix bug with inline elements in blockquotes conflicting with strict doctype
-- Detect if HTML support is disabled for DOM by checking for loadHTML() method.
-- Fix bug where dots and double-dots in absolute URLs without hostname were
-  not collapsed by URIFilter_MakeAbsolute.
-- Fix bug with anonymous modules operating on SafeEmbed or SafeObject elements
-  by reordering their addition.
-- Will now throw exception on many error conditions during lexer creation; also
-  throw an exception when MaintainLineNumbers is true, but a non-tracksLineNumbers
-  is being used.
-- Detect if domxml extension is loaded, and use DirectLEx accordingly.
-- Improve handling of big numbers with floating point arithmetic in UnitConverter.
-  Reported by David Morton.
-. Strategy_MakeWellFormed now operates in-place, saving memory and allowing
-  for more interesting filter-backtracking
-. New HTMLPurifier_Injector->rewind() functionality, allows injectors to rewind
-  index to reprocess tokens.
-. StringHashParser now allows for multiline sections with "empty" content;
-  previously the section would remain undefined.
-. Added --quick option to multitest.php, which tests only the most recent
-  release for each series.
-. Added --distro option to multitest.php, which accepts either 'normal' or
-  'standalone'. This supercedes --exclude-normal and --exclude-standalone
-
-3.1.1, released 2008-06-19
-# %URI.Munge now, by default, does not munge resources (for example, <img src="">)
-  In order to enable this again, please set %URI.MungeResources to true.
-! More robust imagecrash protection with height/width CSS with %CSS.MaxImgLength,
-  and height/width HTML with %HTML.MaxImgLength.
-! %URI.MungeSecretKey for secure URI munging. Thanks Chris
-  for sponsoring this feature. Check out the corresponding documentation
-  for details. (Att Nightly testers: The API for this feature changed before
-  the general release. Namely, rename your directives %URI.SecureMungeSecretKey =>
-  %URI.MungeSecretKey and and %URI.SecureMunge => %URI.Munge)
-! Implemented post URI filtering. Set member variable $post to true to set
-  a URIFilter as such.
-! Allow modules to define injectors via $info_injector. Injectors are
-  automatically disabled if injector's needed elements are not found.
-! Support for "safe" objects added, use %HTML.SafeObject and %HTML.SafeEmbed.
-  Thanks Chris for sponsoring. If you've been using ad hoc code from the
-  forums, PLEASE use this instead.
-! Added substitutions for %e, %n, %a and %p in %URI.Munge (in order,
-  embedded, tag name, attribute name, CSS property name). See %URI.Munge
-  for more details. Requested by Jochem Blok.
-- Disable percent height/width attributes for img.
-- AttrValidator operations are now atomic; updates to attributes are not
-  manifest in token until end of operations. This prevents naughty internal
-  code from directly modifying CurrentToken when they're not supposed to.
-  This semantics change was requested by frank farmer.
-- Percent encoding checks enabled for URI query and fragment
-- Fix stray backslashes in font-family; CSS Unicode character escapes are
-  now properly resolved (although *only* in font-family). Thanks Takeshi Terada
-  for reporting.
-- Improve parseCDATA algorithm to take into account newline normalization
-- Account for browser confusion between Yen character and backslash in
-  Shift_JIS encoding. This fix generalizes to any other encoding which is not
-  a strict superset of printable ASCII. Thanks Takeshi Terada for reporting.
-- Fix missing configuration parameter in Generator calls. Thanks vs for the
-  partial patch.
-- Improved adherence to Unicode by checking for non-character codepoints.
-  Thanks Geoffrey Sneddon for reporting. This may result in degraded
-  performance for extremely large inputs.
-- Allow CSS property-value pair ''text-decoration: none''. Thanks Jochem Blok
-  for reporting.
-. Added HTMLPurifier_UnitConverter and HTMLPurifier_Length for convenient
-  handling of CSS-style lengths. HTMLPurifier_AttrDef_CSS_Length now uses
-  this class.
-. API of HTMLPurifier_AttrDef_CSS_Length changed from __construct($disable_negative)
-  to __construct($min, $max). __construct(true) is equivalent to
-  __construct('0').
-. Added HTMLPurifier_AttrDef_Switch class
-. Rename HTMLPurifier_HTMLModule_Tidy->construct() to setup() and bubble method
-  up inheritance hierarchy to HTMLPurifier_HTMLModule. All HTMLModules
-  get this called with the configuration object.  All modules now
-  use this rather than __construct(), although legacy code using constructors
-  will still work--the new format, however, lets modules access the
-  configuration object for HTML namespace dependant tweaks.
-. AttrDef_HTML_Pixels now takes a single construction parameter, pixels.
-. ConfigSchema data-structure heavily optimized; on average it uses a third
-  the memory it did previously. The interface has changed accordingly,
-  consult changes to HTMLPurifier_Config for details.
-. Variable parsing types now are magic integers instead of strings
-. Added benchmark for ConfigSchema
-. HTMLPurifier_Generator requires $config and $context parameters. If you
-  don't know what they should be, use HTMLPurifier_Config::createDefault()
-  and new HTMLPurifier_Context().
-. Printers now properly distinguish between output configuration, and
-  target configuration. This is not applicable to scripts using
-  the Printers for HTML Purifier related tasks.
-. HTML/CSS Printers must be primed with prepareGenerator($gen_config), otherwise
-  fatal errors will ensue.
-. URIFilter->prepare can return false in order to abort loading of the filter
-. Factory for AttrDef_URI implemented, URI#embedded to indicate URI that embeds
-  an external resource.
-. %URI.Munge functionality factored out into a post-filter class.
-. Added CurrentCSSProperty context variable during CSS validation
-
-3.1.0, released 2008-05-18
-# Unnecessary references to objects (vestiges of PHP4) removed from method
-  signatures.  The following methods do not need references when assigning from
-  them and will result in E_STRICT errors if you try:
-    + HTMLPurifier_Config->get*Definition() [* = HTML, CSS]
-    + HTMLPurifier_ConfigSchema::instance()
-    + HTMLPurifier_DefinitionCacheFactory::instance()
-    + HTMLPurifier_DefinitionCacheFactory->create()
-    + HTMLPurifier_DoctypeRegistry->register()
-    + HTMLPurifier_DoctypeRegistry->get()
-    + HTMLPurifier_HTMLModule->addElement()
-    + HTMLPurifier_HTMLModule->addBlankElement()
-    + HTMLPurifier_LanguageFactory::instance()
-# Printer_ConfigForm's get*() functions were static-ified
-# %HTML.ForbiddenAttributes requires attribute declarations to be in the
-  form of tag@attr, NOT tag.attr (which will throw an error and won't do
-  anything). This is for forwards compatibility with XML; you'd do best
-  to migrate an %HTML.AllowedAttributes directives to this syntax too.
-! Allow index to be false for config from form creation
-! Added HTMLPurifier::VERSION constant
-! Commas, not dashes, used for serializer IDs. This change is forwards-compatible
-  and allows for version numbers like "3.1.0-dev".
-! %HTML.Allowed deals gracefully with whitespace anywhere, anytime!
-! HTML Purifier's URI handling is a lot more robust, with much stricter
-  validation checks and better percent encoding handling. Thanks Gareth Heyes
-  for indicating security vulnerabilities from lax percent encoding.
-! Bootstrap autoloader deals more robustly with classes that don't exist,
-  preventing class_exists($class, true) from barfing.
-- InterchangeBuilder now alphabetizes its lists
-- Validation error in configdoc output fixed
-- Iconv and other encoding errors muted even with custom error handlers that
-  do not honor error_reporting
-- Add protection against imagecrash attack with CSS height/width
-- HTMLPurifier::instance() created for consistency, is equivalent to getInstance()
-- Fixed and revamped broken ConfigForm smoketest
-- Bug with bool/null fields in Printer_ConfigForm fixed
-- Bug with global forbidden attributes fixed
-- Improved error messages for allowed and forbidden HTML elements and attributes
-- Missing (or null) in configdoc documentation restored
-- If DOM throws and exception during parsing with PH5P (occurs in newer versions
-  of DOM), HTML Purifier punts to DirectLex
-- Fatal error with unserialization of ScriptRequired
-- Created directories are now chmod'ed properly
-- Fixed bug with fallback languages in LanguageFactory
-- Standalone testing setup properly with autoload
-. Out-of-date documentation revised
-. UTF-8 encoding check optimization as suggested by Diego
-. HTMLPurifier_Error removed in favor of exceptions
-. More copy() function removed; should use clone instead
-. More extensive unit tests for HTMLDefinition
-. assertPurification moved to central harness
-. HTMLPurifier_Generator accepts $config and $context parameters during
-  instantiation, not runtime
-. Double-quotes outside of attribute values are now unescaped
-
-3.1.0rc1, released 2008-04-22
-# Autoload support added. Internal require_once's removed in favor of an
-  explicit require list or autoloading. To use HTML Purifier,
-  you must now either use HTMLPurifier.auto.php
-  or HTMLPurifier.includes.php; setting the include path and including
-  HTMLPurifier.php is insufficient--in such cases include HTMLPurifier.autoload.php
-  as well to register our autoload handler (or modify your autoload function
-  to check HTMLPurifier_Bootstrap::getPath($class)). You can also use
-  HTMLPurifier.safe-includes.php for a less performance friendly but more
-  user-friendly library load.
-# HTMLPurifier_ConfigSchema static functions are officially deprecated. Schema
-  information is stored in the ConfigSchema directory, and the
-  maintenance/generate-schema-cache.php generates the schema.ser file, which
-  is now instantiated. Support for userland schema changes coming soon!
-# HTMLPurifier_Config will now throw E_USER_NOTICE when you use a directive
-  alias; to get rid of these errors just modify your configuration to use
-  the new directive name.
-# HTMLPurifier->addFilter is deprecated; built-in filters can now be
-  enabled using %Filter.$filter_name or by setting your own filters using
-  %Filter.Custom
-# Directive-level safety properties superceded in favor of module-level
-  safety. Internal method HTMLModule->addElement() has changed, although
-  the externally visible HTMLDefinition->addElement has *not* changed.
-! Extra utility classes for testing and non-library operations can
-  be found in extras/. Specifically, these are FSTools and ConfigDoc.
-  You may find a use for these in your own project, but right now they
-  are highly experimental and volatile.
-! Integration with PHPT allows for automated smoketests
-! Limited support for proprietary HTML elements, namely <marquee>, sponsored
-  by Chris. You can enable them with %HTML.Proprietary if your client
-  demands them.
-! Support for !important CSS cascade modifier. By default, this will be stripped
-  from CSS, but you can enable it using %CSS.AllowImportant
-! Support for display and visibility CSS properties added, set %CSS.AllowTricky
-  to true to use them.
-! HTML Purifier now has its own Exception hierarchy under HTMLPurifier_Exception.
-  Developer error (not enduser error) can cause these to be triggered.
-! Experimental kses() wrapper introduced with HTMLPurifier.kses.php
-! Finally %CSS.AllowedProperties for tweaking allowed CSS properties without
-  mucking around with HTMLPurifier_CSSDefinition
-! ConfigDoc output has been enhanced with version and deprecation info.
-! %HTML.ForbiddenAttributes and %HTML.ForbiddenElements implemented.
-- Autoclose now operates iteratively, i.e. <span><span><div> now has
-  both span tags closed.
-- Various HTMLPurifier_Config convenience functions now accept another parameter
-  $schema which defines what HTMLPurifier_ConfigSchema to use besides the
-  global default.
-- Fix bug with trusted script handling in libxml versions later than 2.6.28.
-- Fix bug in ExtractStyleBlocks with comments in style tags
-- Fix bug in comment parsing for DirectLex
-- Flush output now displayed when in command line mode for unit tester
-- Fix bug with rgb(0, 1, 2) color syntax with spaces inside shorthand syntax
-- HTMLPurifier_HTMLDefinition->addAttribute can now be called multiple times
-  on the same element without emitting errors.
-- Fixed fatal error in PH5P lexer with invalid tag names
-. Plugins now get their own changelogs according to project conventions.
-. Convert tokens to use instanceof, reducing memory footprint and
-  improving comparison speed.
-. Dry runs now supported in SimpleTest; testing facilities improved
-. Bootstrap class added for handling autoloading functionality
-. Implemented recursive glob at FSTools->globr
-. ConfigSchema now has instance methods for all corresponding define*
-  static methods.
-. A couple of new historical maintenance scripts were added.
-. HTMLPurifier/HTMLModule/Tidy/XHTMLAndHTML4.php split into two files
-. tests/index.php can now be run from any directory.
-. HTMLPurifier_Token subclasses split into seperate files
-. HTMLPURIFIER_PREFIX now is defined in Bootstrap.php, NOT HTMLPurifier.php
-. HTMLPURIFIER_PREFIX can now be defined outside of HTML Purifier
-. New --php=php flag added, allows PHP executable to be specified (command
-  line only!)
-. htmlpurifier_add_test() preferred method to translate test files in to
-  classes, because it handles PHPT files too.
-. Debugger class is deprecated and will be removed soon.
-. Command line argument parsing for testing scripts revamped, now --opt value
-  format is supported.
-. Smoketests now cleanup after magic quotes
-. Generator now can output comments (however, comments are still stripped
-  from HTML Purifier output)
-. HTMLPurifier_ConfigSchema->validate() deprecated in favor of
-  HTMLPurifier_VarParser->parse()
-. Integers auto-cast into float type by VarParser.
-. HTMLPURIFIER_STRICT removed; no validation is performed on runtime, only
-  during cache generation
-. Reordered script calls in maintenance/flush.php
-. Command line scripts now honor exit codes
-. When --flush fails in unit testers, abort tests and print message
-. Improved documentation in docs/dev-flush.html about the maintenance scripts
-. copy() methods removed in favor of clone keyword
-
-3.0.0, released 2008-01-06
-# HTML Purifier is PHP 5 only! The 2.1.x branch will be maintained
-  until PHP 4 is completely deprecated, but no new features will be added
-  to it.
-  + Visibility declarations added
-  + Constructor methods renamed to __construct()
-  + PHP4 reference cruft removed (in progress)
-! CSS properties are now case-insensitive
-! DefinitionCacheFactory now can register new implementations
-! New HTMLPurifier_Filter_ExtractStyleBlocks for extracting <style> from
-  documents and cleaning their contents up. Requires the CSSTidy library
-  <http://csstidy.sourceforge.net/>. You can access the blocks with the
-  'StyleBlocks' Context variable ($purifier->context->get('StyleBlocks')).
-  The output CSS can also be "scoped" for a specific element, use:
-  %Filter.ExtractStyleBlocksScope
-! Experimental support for some proprietary CSS attributes allowed:
-  opacity (and all of the browser-specific equivalents) and scrollbar colors.
-  Enable by setting %CSS.Proprietary to true.
-- Colors missing # but in hex form will be corrected
-- CSS Number algorithm improved
-- Unit testing and multi-testing now on steroids: command lines,
-  XML output, and other goodies now added.
-. Unit tests for Injector improved
-. New classes:
-  + HTMLPurifier_AttrDef_CSS_AlphaValue
-  + HTMLPurifier_AttrDef_CSS_Filter
-. Multitest now has a file docblock
-
-2.1.3, released 2007-11-05
-! tests/multitest.php allows you to test multiple versions by running
-  tests/index.php through multiple interpreters using `phpv` shell
-  script (you must provide this script!)
-- Fixed poor include ordering for Email URI AttrDefs, causes fatal errors
-  on some systems.
-- Injector algorithm further refined: off-by-one error regarding skip
-  counts for dormant injectors fixed
-- Corrective blockquote definition now enabled for HTML 4.01 Strict
-- Fatal error when <img> tag (or any other element with required attributes)
-  has 'id' attribute fixed, thanks NykO18 for reporting
-- Fix warning emitted when a non-supported URI scheme is passed to the
-  MakeAbsolute URIFilter, thanks NykO18 (again)
-- Further refine AutoParagraph injector. Behavior inside of elements
-  allowing paragraph tags clarified: only inline content delimeted by
-  double newlines (not block elements) are paragraphed.
-- Buggy treatment of end tags of elements that have required attributes
-  fixed (does not manifest on default tag-set)
-- Spurious internal content reorganization error suppressed
-- HTMLDefinition->addElement now returns a reference to the created
-  element object, as implied by the documentation
-- Phorum mod's HTML Purifier help message expanded (unreleased elsewhere)
-- Fix a theoretical class of infinite loops from DirectLex reported
-  by Nate Abele
-- Work around unnecessary DOMElement type-cast in PH5P that caused errors
-  in PHP 5.1
-- Work around PHP 4 SimpleTest lack-of-error complaining for one-time-only
-  HTMLDefinition errors, this may indicate problems with error-collecting
-  facilities in PHP 5
-- Make ErrorCollectorEMock work in both PHP 4 and PHP 5
-- Make PH5P work with PHP 5.0 by removing unnecessary array parameter typedef
-. %Core.AcceptFullDocuments renamed to %Core.ConvertDocumentToFragment
-  to better communicate its purpose
-. Error unit tests can now specify the expectation of no errors. Future
-  iterations of the harness will be extremely strict about what errors
-  are allowed
-. Extend Injector hooks to allow for more powerful injector routines
-. HTMLDefinition->addBlankElement created, as according to the HTMLModule
-  method
-. Doxygen configuration file updated, with minor improvements
-. Test runner now checks for similarly named files in conf/ directory too.
-. Minor cosmetic change to flush-definition-cache.php: trailing newline is
-  outputted
-. Maintenance script for generating PH5P patch added, original PH5P source
-  file also added under version control
-. Full unit test runner script title made more descriptive with PHP version
-. Updated INSTALL file to state that 4.3.7 is the earliest version we
-  are actively testing
-
-2.1.2, released 2007-09-03
-! Implemented Object module for trusted users
-! Implemented experimental HTML5 parsing mode using PH5P. To use, add
-  this to your code:
-        require_once 'HTMLPurifier/Lexer/PH5P.php';
-        $config->set('Core', 'LexerImpl', 'PH5P');
-  Note that this Lexer introduces some classes not in the HTMLPurifier
-  namespace.  Also, this is PHP5 only.
-! CSS property border-spacing implemented
-- Fix non-visible parsing error in DirectLex with empty tags that have
-  slashes inside attribute values.
-- Fix typo in CSS definition: border-collapse:seperate; was incorrectly
-  accepted as valid CSS. Usually non-visible, because this styling is the
-  default for tables in most browsers. Thanks Brett Zamir for pointing
-  this out.
-- Fix validation errors in configuration form
-- Hammer out a bunch of edge-case bugs in the standalone distribution
-- Inclusion reflection removed from URISchemeRegistry; you must manually
-  include any new schema files you wish to use
-- Numerous typo fixes in documentation thanks to Brett Zamir
-. Unit test refactoring for one logical test per test function
-. Config and context parameters in ComplexHarness deprecated: instead, edit
-  the $config and $context member variables
-. HTML wrapper in DOMLex now takes DTD identifiers into account; doesn't
-  really make a difference, but is good for completeness sake
-. merge-library.php script refactored for greater code reusability and
-  PHP4 compatibility
-
-2.1.1, released 2007-08-04
-- Fix show-stopper bug in %URI.MakeAbsolute functionality
-- Fix PHP4 syntax error in standalone version
-. Add prefix directory to include path for standalone, this prevents
-  other installations from clobbering the standalone's URI schemes
-. Single test methods can be invoked by prefixing with __only
-
-2.1.0, released 2007-08-02
-# flush-htmldefinition-cache.php superseded in favor of a generic
-  flush-definition-cache.php script, you can clear a specific cache
-  by passing its name as a parameter to the script
-! Phorum mod implemented for HTML Purifier
-! With %Core.AggressivelyFixLt, <3 and similar emoticons no longer
-  trigger HTML removal in PHP5 (DOMLex). This directive is not necessary
-  for PHP4 (DirectLex).
-! Standalone file now available, which greatly reduces the amount of
-  includes (although there are still a few files that reside in the
-  standalone folder)
-! Relative URIs can now be transformed into their absolute equivalents
-  using %URI.Base and %URI.MakeAbsolute
-! Ruby implemented for XHTML 1.1
-! You can now define custom URI filtering behavior, see enduser-uri-filter.html
-  for more details
-! UTF-8 font names now supported in CSS
-- AutoFormatters emit friendly error messages if tags or attributes they
-  need are not allowed
-- ConfigForm's compactification of directive names is now configurable
-- AutoParagraph autoformatter algorithm refined after field-testing
-- XHTML 1.1 now applies XHTML 1.0 Strict cleanup routines, namely
-  blockquote wrapping
-- Contents of <style> tags removed by default when tags are removed
-. HTMLPurifier_Config->getSerial() implemented, this is extremely useful
-  for output cache invalidation
-. ConfigForm printer now can retrieve CSS and JS files as strings, in
-  case HTML Purifier's directory is not publically accessible
-. Introduce new text/itext configuration directive values: these represent
-  longer strings that would be more appropriately edited with a textarea
-. Allow newlines to act as separators for lists, hashes, lookups and
-  %HTML.Allowed
-. ConfigForm generates textareas instead of text inputs for lists, hashes,
-  lookups, text and itext fields
-. Hidden element content removal genericized: %Core.HiddenElements can
-  be used to customize this behavior, by default <script> and <style> are
-  hidden
-. Added HTMLPURIFIER_PREFIX constant, should be used instead of dirname(__FILE__)
-. Custom ChildDef added to default include list
-. URIScheme reflection improved: will not attempt to include file if class
-  already exists. May clobber autoload, so I need to keep an eye on it
-. ConfigSchema heavily optimized, will only collect information and validate
-  definitions when HTMLPURIFIER_SCHEMA_STRICT is true.
-. AttrDef_URI unit tests and implementation refactored
-. benchmarks/ directory now protected from public view with .htaccess file;
-  run the tests via command line
-. URI scheme is munged off if there is no authority and the scheme is the
-  default one
-. All unit tests inherit from HTMLPurifier_Harness, not UnitTestCase
-. Interface for URIScheme changed
-. Generic URI object to hold components of URI added, most systems involved
-  in URI validation have been migrated to use it
-. Custom filtering for URIs factored out to URIDefinition interface for
-  maximum extensibility
-
-2.0.1, released 2007-06-27
-! Tag auto-closing now based on a ChildDef heuristic rather than a
-  manually set auto_close array; some behavior may change
-! Experimental AutoFormat functionality added: auto-paragraph and
-  linkify your HTML input by setting %AutoFormat.AutoParagraph and
-  %AutoFormat.Linkify to true
-! Newlines normalized internally, and then converted back to the
-  value of PHP_EOL. If this is not desired, set your newline format
-  using %Output.Newline.
-! Beta error collection, messages are implemented for the most generic
-  cases involving Lexing or Strategies
-- Clean up special case code for <script> tags
-- Reorder includes for DefinitionCache decorators, fixes a possible
-  missing class error
-- Fixed bug where manually modified definitions were not saved via cache
-  (mostly harmless, except for the fact that it would be a little slower)
-- Configuration objects with different serials do not clobber each
-  others when revision numbers are unequal
-- Improve Serializer DefinitionCache directory permissions checks
-- DefinitionCache no longer throws errors when it encounters old
-  serial files that do not conform to the current style
-- Stray xmlns attributes removed from configuration documentation
-- configForm.php smoketest no longer has XSS vulnerability due to
-  unescaped print_r output
-- Printer adheres to configuration's directives on output format
-- Fix improperly named form field in ConfigForm printer
-. Rewire some test-cases to swallow errors rather than expect them
-. HTMLDefinition printer updated with some of the new attributes
-. DefinitionCache keys reordered to reflect precedence: version number,
-  hash, then revision number
-. %Core.DefinitionCache renamed to %Cache.DefinitionImpl
-. Interlinking in configuration documentation added using
-  Injector_PurifierLinkify
-. Directives now keep track of aliases to themselves
-. Error collector now requires a severity to be passed, use PHP's internal
-  error constants for this
-. HTMLPurifier_Config::getAllowedDirectivesForForm implemented, allows
-  much easier selective embedding of configuration values
-. Doctype objects now accept public and system DTD identifiers
-. %HTML.Doctype is now constrained by specific values, to specify a custom
-  doctype use new %HTML.CustomDoctype
-. ConfigForm truncates long directives to keep the form small, and does
-  not re-output namespaces
-
-2.0.0, released 2007-06-20
-# Completely refactored HTMLModuleManager, decentralizing safety
-  information
-# Transform modules changed to Tidy modules, which offer more flexibility
-  and better modularization
-# Configuration object now finalizes itself when a read operation is
-  performed on it, ensuring that its internal state stays consistent.
-  To revert this behavior, you can set the $autoFinalize member variable
-  off, but it's not recommended.
-# New compact syntax for AttrDef objects that can be used to instantiate
-  new objects via make()
-# Definitions (esp. HTMLDefinition) are now cached for a significant
-  performance boost. You can disable caching by setting %Core.DefinitionCache
-  to null. You CANNOT edit raw definitions without setting the corresponding
-  DefinitionID directive (%HTML.DefinitionID for HTMLDefinition).
-# Contents between <script> tags are now completely removed if <script>
-  is not allowed
-# Prototype-declarations for Lexer removed in favor of configuration
-  determination of Lexer implementations.
-! HTML Purifier now works in PHP 4.3.2.
-! Configuration form-editing API makes tweaking HTMLPurifier_Config a
-  breeze!
-! Configuration directives that accept hashes now allow new string
-  format: key1:value1,key2:value2
-! ConfigDoc now factored into OOP design
-! All deprecated elements now natively supported
-! Implement TinyMCE styled whitelist specification format in
-  %HTML.Allowed
-! Config object gives more friendly error messages when things go wrong
-! Advanced API implemented: easy functions for creating elements (addElement)
-  and attributes (addAttribute) on HTMLDefinition
-! Add native support for required attributes
-- Deprecated and removed EnableRedundantUTF8Cleaning. It didn't even work!
-- DOMLex will not emit errors when a custom error handler that does not
-  honor error_reporting is used
-- StrictBlockquote child definition refrains from wrapping whitespace
-  in tags now.
-- Bug resulting from tag transforms to non-allowed elements fixed
-- ChildDef_Custom's regex generation has been improved, removing several
-  false positives
-. Unit test for ElementDef created, ElementDef behavior modified to
-  be more flexible
-. Added convenience functions for HTMLModule constructors
-. AttrTypes now has accessor functions that should be used instead
-  of directly manipulating info
-. TagTransform_Center deprecated in favor of generic TagTransform_Simple
-. Add extra protection in AttrDef_URI against phantom Schemes
-. Doctype object added to HTMLDefinition which describes certain aspects
-  of the operational document type
-. Lexer is now pre-emptively included, with a conditional include for the
-  PHP5 only version.
-. HTMLDefinition and CSSDefinition have a common parent class: Definition.
-. DirectLex can now track line-numbers
-. Preliminary error collector is in place, although no code actually reports
-  errors yet
-. Factor out most of ValidateAttributes to new AttrValidator class
-
-1.6.1, released 2007-05-05
-! Support for more deprecated attributes via transformations:
-  + hspace and vspace in img
-  + size and noshade in hr
-  + nowrap in td
-  + clear in br
-  + align in caption, table, img and hr
-  + type in ul, ol and li
-! DirectLex now preserves text in which a < bracket is followed by
-  a non-alphanumeric character. This means that certain emoticons
-  are now preserved.
-! %Core.RemoveInvalidImg is now operational, when set to false invalid
-  images will hang around with an empty src
-! target attribute in a tag supported, use %Attr.AllowedFrameTargets
-  to enable
-! CSS property white-space now allows nowrap (supported in all modern
-  browsers) but not others (which have spotty browser implementations)
-! XHTML 1.1 mode now sort-of works without any fatal errors, and
-  lang is now moved over to xml:lang.
-! Attribute transformation smoketest available at smoketests/attrTransform.php
-! Transformation of font's size attribute now handles super-large numbers
-- Possibly fatal bug with __autoload() fixed in module manager
-- Invert HTMLModuleManager->addModule() processing order to check
-  prefixes first and then the literal module
-- Empty strings get converted to empty arrays instead of arrays with
-  an empty string in them.
-- Merging in attribute lists now works.
-. Demo script removed: it has been added to the website's repository
-. Basic.php script modified to work out of the box
-. Refactor AttrTransform classes to reduce duplication
-. AttrTransform_TextAlign axed in favor of a more general
-  AttrTransform_EnumToCSS, refer to HTMLModule/TransformToStrict.php to
-  see how the new equivalent is implemented
-. Unit tests now use exclusively assertIdentical
-
-1.6.0, released 2007-04-01
-! Support for most common deprecated attributes via transformations:
-  + bgcolor in td, th, tr and table
-  + border in img
-  + name in a and img
-  + width in td, th and hr
-  + height in td, th
-! Support for CSS attribute 'height' added
-! Support for rel and rev attributes in a tags added, use %Attr.AllowedRel
-  and %Attr.AllowedRev to activate
-- You can define ID blacklists using regular expressions via
-  %Attr.IDBlacklistRegexp
-- Error messages are emitted when you attempt to "allow" elements or
-  attributes that HTML Purifier does not support
-- Fix segfault in unit test. The problem is not very reproduceable and
-  I don't know what causes it, but a six line patch fixed it.
-
-1.5.0, released 2007-03-23
-! Added a rudimentary I18N and L10N system modeled off MediaWiki. It
-  doesn't actually do anything yet, but keep your eyes peeled.
-! docs/enduser-utf8.html explains how to use UTF-8 and HTML Purifier
-! Newly structured HTMLDefinition modeled off of XHTML 1.1 modules.
-  I am loathe to release beta quality APIs, but this is exactly that;
-  don't use the internal interfaces if you're not willing to do migration
-  later on.
-- Allow 'x' subtag in language codes
-- Fixed buggy chameleon-support for ins and del
-. Added support for IDREF attributes (i.e. for)
-. Renamed HTMLPurifier_AttrDef_Class to HTMLPurifier_AttrDef_Nmtokens
-. Removed context variable ParentType, replaced with IsInline, which
-  is false when you're not inline and an integer of the parent that
-  caused you to become inline when you are (so possibly zero)
-. Removed ElementDef->type in favor of ElementDef->descendants_are_inline
-  and HTMLDefinition->content_sets
-. StrictBlockquote now reports what elements its supposed to allow,
-  rather than what it does allow
-. Removed HTMLDefinition->info_flow_elements in favor of
-  HTMLDefinition->content_sets['Flow']
-. Removed redundant "exclusionary" definitions from DTD roster
-. StrictBlockquote now requires a construction parameter as if it
-  were an Required ChildDef, this is the "real" set of allowed elements
-. AttrDef partitioned into HTML, CSS and URI segments
-. Modify Youtube filter regexp to be multiline
-. Require both PHP5 and DOM extension in order to use DOMLex, fixes
-  some edge cases where a DOMDocument class exists in a PHP4 environment
-  due to DOM XML extension.
-
-1.4.1, released 2007-01-21
-! docs/enduser-youtube.html updated according to new functionality
-- YouTube IDs can have underscores and dashes
-
-1.4.0, released 2007-01-21
-! Implemented list-style-image, URIs now allowed in list-style
-! Implemented background-image, background-repeat, background-attachment
-  and background-position CSS properties. Shorthand property background
-  supports all of these properties.
-! Configuration documentation looks nicer
-! Added %Core.EscapeNonASCIICharacters to workaround loss of Unicode
-  characters while %Core.Encoding is set to a non-UTF-8 encoding.
-! Support for configuration directive aliases added
-! Config object can now be instantiated from ini files
-! YouTube preservation code added to the core, with two lines of code
-  you can add it as a filter to your code. See smoketests/preserveYouTube.php
-  for sample code.
-! Moved SLOW to docs/enduser-slow.html and added code examples
-- Replaced version check with functionality check for DOM (thanks Stephen
-  Khoo)
-. Added smoketest 'all.php', which loads all other smoketests via frames
-. Implemented AttrDef_CSSURI for url(http://google.com) style declarations
-. Added convenient single test selector form on test runner
-
-1.3.2, released 2006-12-25
-! HTMLPurifier object now accepts configuration arrays, no need to manually
-  instantiate a configuration object
-! Context object now accessible to outside
-! Added enduser-youtube.html, explains how to embed YouTube videos. See
-  also corresponding smoketest preserveYouTube.php.
-! Added purifyArray(), which takes a list of HTML and purifies it all
-! Added static member variable $version to HTML Purifier with PHP-compatible
-  version number string.
-- Fixed fatal error thrown by upper-cased language attributes
-- printDefinition.php: added labels, added better clarification
-. HTMLPurifier_Config::create() added, takes mixed variable and converts into
-  a HTMLPurifier_Config object.
-
-1.3.1, released 2006-12-06
-! Added HTMLPurifier.func.php stub for a convenient function to call the library
-- Fixed bug in RemoveInvalidImg code that caused all images to be dropped
-  (thanks to .mario for reporting this)
-. Standardized all attribute handling variables to attr, made it plural
-
-1.3.0, released 2006-11-26
-# Invalid images are now removed, rather than replaced with a dud
-  <img src="" alt="Invalid image" />. Previous behavior can be restored
-  with new directive %Core.RemoveInvalidImg set to false.
-! (X)HTML Strict now supported
-  + Transparently handles inline elements in block context (blockquote)
-! Added GET method to demo for easier validation, added 50kb max input size
-! New directive %HTML.BlockWrapper, for block-ifying inline elements
-! New directive %HTML.Parent, allows you to only allow inline content
-! New directives %HTML.AllowedElements and %HTML.AllowedAttributes to let
-  users narrow the set of allowed tags
-! <li value="4"> and <ul start="2"> now allowed in loose mode
-! New directives %URI.DisableExternalResources and %URI.DisableResources
-! New directive %Attr.DisableURI, which eliminates all hyperlinking
-! New directive %URI.Munge, munges URI so you can use some sort of redirector
-  service to avoid PageRank leaks or warn users that they are exiting your site.
-! Added spiffy new smoketest printDefinition.php, which lets you twiddle with
-  the configuration settings and see how the internal rules are affected.
-! New directive %URI.HostBlacklist for blocking links to bad hosts.
-  xssAttacks.php smoketest updated accordingly.
-- Added missing type to ChildDef_Chameleon
-- Remove Tidy option from demo if there is not Tidy available
-. ChildDef_Required guards against empty tags
-. Lookup table HTMLDefinition->info_flow_elements added
-. Added peace-of-mind variable initialization to Strategy_FixNesting
-. Added HTMLPurifier->info_parent_def, parent child processing made special
-. Added internal documents briefly summarizing future progression of HTML
-. HTMLPurifier_Config->getBatch($namespace) added
-. More lenient casting to bool from string in HTMLPurifier_ConfigSchema
-. Refactored ChildDef classes into their own files
-
-1.2.0, released 2006-11-19
-# ID attributes now disabled by default. New directives:
-  + %HTML.EnableAttrID - restores old behavior by allowing IDs
-  + %Attr.IDPrefix - %Attr.IDBlacklist alternative that munges all user IDs
-    so that they don't collide with your IDs
-  + %Attr.IDPrefixLocal - Same as above, but for when there are multiple
-    instances of user content on the page
-  + Profuse documentation on how to use these available in docs/enduser-id.txt
-! Added MODx plugin <http://modxcms.com/forums/index.php/topic,6604.0.html>
-! Added percent encoding normalization
-! XSS attacks smoketest given facelift
-! Configuration documentation now has table of contents
-! Added %URI.DisableExternal, which prevents links to external websites.  You
-  can also use %URI.Host to permit absolute linking to subdomains
-! Non-accessible resources (ex. mailto) blocked from embedded URIs (img src)
-- Type variable in HTMLDefinition was not being set properly, fixed
-- Documentation updated
-  + TODO added request Phalanger
-  + TODO added request Native compression
-  + TODO added request Remove redundant tags
-  + TODO added possible plaintext formatter for HTML Purifier documentation
-  + Updated ConfigDoc TODO
-  + Improved inline comments in AttrDef/Class.php, AttrDef/CSS.php
-    and AttrDef/Host.php
-  + Revamped documentation into HTML, along with misc updates
-- HTMLPurifier_Context doesn't throw a variable reference error if you attempt
-  to retrieve a non-existent variable
-. Switched to purify()-wide Context object registry
-. Refactored unit tests to minimize duplication
-. XSS attack sheet updated
-. configdoc.xml now has xml:space attached to default value nodes
-. Allow configuration directives to permit null values
-. Cleaned up test-cases to remove unnecessary swallowErrors()
-
-1.1.2, released 2006-09-30
-! Add HTMLPurifier.auto.php stub file that configures include_path
-- Documentation updated
-  + INSTALL document rewritten
-  + TODO added semi-lossy conversion
-  + API Doxygen docs' file exclusions updated
-  + Added notes on HTML versus XML attribute whitespace handling
-  + Noted that HTMLPurifier_ChildDef_Custom isn't being used
-  + Noted that config object's definitions are cached versions
-- Fixed lack of attribute parsing in HTMLPurifier_Lexer_PEARSax3
-- ftp:// URIs now have their typecodes checked
-- Hooked up HTMLPurifier_ChildDef_Custom's unit tests (they weren't being run)
-. Line endings standardized throughout project (svn:eol-style standardized)
-. Refactored parseData() to general Lexer class
-. Tester named "HTML Purifier" not "HTMLPurifier"
-
-1.1.1, released 2006-09-24
-! Configuration option to optionally Tidy up output for indentation to make up
-  for dropped whitespace by DOMLex (pretty-printing for the entire application
-  should be done by a page-wide Tidy)
-- Various documentation updates
-- Fixed parse error in configuration documentation script
-- Fixed fatal error in benchmark scripts, slightly augmented
-- As far as possible, whitespace is preserved in-between table children
-- Sample test-settings.php file included
-
-1.1.0, released 2006-09-16
-! Directive documentation generation using XSLT
-! XHTML can now be turned off, output becomes <br>
-- Made URI validator more forgiving: will ignore leading and trailing
-  quotes, apostrophes and less than or greater than signs.
-- Enforce alphanumeric namespace and directive names for configuration.
-- Table child definition made more flexible, will fix up poorly ordered elements
-. Renamed ConfigDef to ConfigSchema
-
-1.0.1, released 2006-09-04
-- Fixed slight bug in DOMLex attribute parsing
-- Fixed rejection of case-insensitive configuration values when there is a
-  set of allowed values.  This manifested in %Core.Encoding.
-- Fixed rejection of inline style declarations that had lots of extra
-  space in them.  This manifested in TinyMCE.
-
-1.0.0, released 2006-09-01
-! Shorthand CSS properties implemented: font, border, background, list-style
-! Basic color keywords translated into hexadecimal values
-! Table CSS properties implemented
-! Support for charsets other than UTF-8 (defined by iconv)
-! Malformed UTF-8 and non-SGML character detection and cleaning implemented
-- Fixed broken numeric entity conversion
-- API documentation completed
-. (HTML|CSS)Definition de-singleton-ized
-
-1.0.0beta, released 2006-08-16
-! First public release, most functionality implemented. Notable omissions are:
-  + Shorthand CSS properties
-  + Table CSS properties
-  + Deprecated attribute transformations
-
-    vim: et sw=4 sts=4