Here’s a summary of changes in each release. The list doesn’t include some small changes or updates to test cases.

• Support : and ! characters in CSS class names (closes #224).
• Support including textile escape sequences inside link title attribute (closes #223).

• HTML void tags render a self-closing slash based on the given document type. If Parser::setDocumentType() is given Parser::DOCTYPE_XHTML, self-closing tags are used, otherwise not.

• Added Parser::setAlignClasses() and Parser::isAlignClassesEnabled(). This can be used to enable img alignment classes in XHTML output document mode, instead of the default align attribute.
• Added Parser::DOCTYPE_HTML5 and Parser::DOCTYPE_XHTML constants. These can be used with Parser::setDocumentType() to specify the output document type.

• Fix deprecation errors that appear on PHP >= 8.1 about preg_split limit argument’s NULL value.

• Support consecutive links without whitespace between using bracket syntax (closes #202, #205 and #206).

• Fix PHP 7.4 compatibility issues (closes #199).

• Fix issue where an inline tag preceding the last character, that is a glyph, is not rendered if the block tags are disabled with Parser::setBlockTags (closes #198).

• Fix issues where divider tags placed on their own line within a paragraph, would disable Textile processing for that paragraph block (closes #194).

• Fix quote and bracket processing around span and other inline tags (closes #191 and #192).

• Fix and omit anchor links prefixing (closes #190).
• Alignment attribute can be specified last within a block tag definition (closes #189)

• Fix problems with list parsing; no longer matches inline-syntax, such as strongs, as list item markers (closes #172).
• Add option to disable specific substitution symbols by setting them to FALSE (see #158).
• Add option to apply classes, such as language-identifiers, to the code element within a bc (closes #96).
• Add Parser::configure(), the method can be extended to create pre-configured parser classes.
• Automatic paragraph wrapping now checks the contents and does not wrap paragraphs already wrapped in non-phrasing HTML tags (closes #22 and #63).
• Add option to disable Textile formatting for blocks wrapped in non-standard HTML-like tags.
• Check for starting list depth (closes #24).
• Add Parser::setImagePrefix(), Parser::setLinkPrefix(), Parser::getImagePrefix() and Parser::getLinkPrefix() (closes #169).
• Add Parser::setRawBlocks() and Parser::isRawBlocksEnabled().
• Deprecate Parser::setRelativeImagePrefix() and Parser::$relativeImagePrefix in favour of the new decoupled methods.

• Fix problems with attribute parsing under PHP >= 7.1 (closes #175 and #176).
• Fix test suite compatibility issues under PHP >= 7.2 (closes #184).
• Fix missing deprecation notices.
• Add test fixture for Unicode characters in image title attributes.
• Tidy entity encoding process (closes #182).
• Drop legacy PHP 5.5 and 5.4 unit test targets due to test suite’s depedencies’ requirements.

• Fix empty-like link texts (closes #141).
• Fix empty-like RedCloth definitions (closes #142).
• Fix empty-like table summaries (closes #143).
• Fix image dimension generation on Windows when doc_root can not be resolved (closes #140).
• Fix HTTP protocol restrictions not affecting images (closes #144).
• Add more versatile parsing method, Parser::parse().
• Add Parser::setRestricted() and Parser::isRestrictedModeEnabled().
• Add Parser::setLite() and Parser::isLiteModeEnabled().
• Add Parser::setDocumentType() and Parser::getDocumentType().
• Add Parser::setDocumentRootDirectory() and Parser::getDocumentRootDirectory().
• Add Parser::setImages() and Parser::isImageTagEnabled().
• Add Parser::setBlockTags() and Parser::isBlockTagEnabled() (closes #138).
• Add Parser::setLinkRelationShip() and Parser::getLinkRelationShip().
• Add Parser::setLineWrap() and Parser::isLineWrapEnabled() (closes #139).
• Deprecate Parser::textileThis(), Parser::textileRestricted() and Parser::textileCommon() in favour of the more versatile Parser::parse().
• Fix: Parser::relURL() now supports unicode characters (closes #146).
• Fix: Undefined variable warning.
• Feature/Fix: Allow link text that contains newline characters (closes #154, #155 & #167).
• Fix: Stop encoding ‘+’ characters in tel: links (closes #156).
• Make dimension glyph replacements a little stricter.
• Fix: Prevent hyphenated class on td cells adding incorrect style (closes #164).
• Jail read of image dimensions to images within the document root path (closes #145).
• Various code cleanups, typo corrections and refactoring.
• Documentation fixes and extensions.

• Fix rendering of left and right image alignment in non-lite restricted mode (closes #132).
• Fix wrong triggered error type when using the deprecated $encode option of Parser::textileThis().
• Fix attribute regular expression to stop it matching multiple times (closes #131).
• Fix rendering of lists in table cells with span attributes set (closes #135).
• Throws an exception if Parser::__construct() is given invalid document type, instead of eating it silently and returning document using the default content-type you weren’t wishing for. Prevents issues where you want HTML5, but silently got XHTML due to typo or an issue in application design.
• Clean user-supplied styles prior to sorting and re-formatting.
• Remove dead code and duplicated procedures as outlined by code coverage reports.
• Remove unused internal method Parser::fSpecial().
• Test code coverage, coding style and run unit tests against HHVM.
• Footnote reference numbers support unicode characters.
• Use named sub-patterns in regular expressions (closes #121).
• Refactored link detection code.

• Fix broken image alignment in HTML5 mode (closes #123).
• Fix duplicate HTML IDs that occur when a footnote isn’t referenced in the content (closes #125).
• Don’t include image alignment to the URL in restricted mode.
• Detect and process quoted quote symbols.
• New link parser (closes #86, #87 and #128).

• Fix double image URL encoding (closes #102).
• Fix URL reference token spoofing.
• Fix broken parser output when $strict argument was set to TRUE (closes #119).
• Fix memory leaking tag cache. Tag cache is never reset between textileThis() and textileRestricted() calls referencing the same instance.
• Fix rare instances where a link displays a wrong URL mentioned elsewhere in the document.
• Fix invalid markup generated when Redcloth-style definition list is used inside a table cell.
• Link aliases follow same allowed URL schemes as normal links.
• Update hasRawText() and fPBr() to detect a wider range of raw HTML and XHTML.
• Unify attribute order with Redcloth.
• Reduce list and blockquote indentation level to match paragraphs and other block tags.
• Restrict how spans are parsed (closes #106).
• Fix citations on spans (closes #120).
• Refactor parseAttribsToArray() slightly.

• Improved support for Redcloth-style definition lists.
  1. Allow multiple terms
  2. Allow linebreaks in terms
• Fix incorrectly rendered rel attributes (closes #103).
• Fix getSymbol() so it actually returns the named symbol (closes #104).
• Fix unicode link aliases that were broken on some PCRE_UTF8 supporting systems.
• Fix collapsing whitespace and preserve newlines. Preserves whitespace inside long bc, notextile and pre blocks, rather than collapsing two or more empty lines down to one. Renders whitespace as it was defined, rather than using hard-coded single LF to separate lines (closes #109 and #111).
• Fix the number of code tags rendered inside long code blocks (closes #116).
• Fix token spoofing from the document body by randomizing token references (closes #115).
• Add image dimensions to images even when Textile is run on command line. On CLI, images are looked from the current working directory.
• Define internal class properties as protected rather than at all, causing them to be created as public.
• Move internal property definitions from the constructor to class definition.
• Added runnable PHPUnit tests, integration with Travis CI.
• Removed error suppression, the code doesn’t intentionally produce notices.
• Add br tags to headings instead of leaving linebreaks untouched.

• Remove horizontal alignment from inline elements (closes #66).
• Reinstate automatic generation of image width and height generation for relative images (closes #101).
• Add setDimensionlessImages() and getDimensionlessImages() to suppress width and height generation for relative images and better support content for responsive layouts (closes #100).
• Allow “.” in class attributes (closes #97).

• Add composer.json to allow installation via the Composer PHP package manager.
• Regular expression improvements (issues #78, #81 and #83).
• Allow pre-encoded > and < as alignments.
• Self-referencing links can now be combined with link aliases. eg. "$":alias1 is now possible.
• Fix memory leak and performance degradation when calling same Textile object multiple times.
• Do not double-encode + or % in urls.
• Remove legacy SVN lines and old Textpattern integration methods.
• Refactored code, removing deprecated methods.
• Fix undefined variable in Redcloth-style definition lists.
• Improvements to image handling (closes #69).
• Extend recognition of dimension sign to more complex cases. Eg…
  1. -0.5 x -.1 x +100 => -0.5 × -.1 × +100
  2. 10 x -€ 110,00 => 10 × -€ 110,00 (this replacement is available only if unicode support is included in your PCRE implementation and any character that is a currency symbol should work)
• Change parse tokens to further prevent glyphs from matching them internally.
• Improve handling of textile within table cells without leading or trailing spaces (eg. |"$":https://github.com"|_Here we are_|==code==| etc).
• Improve handling of lists within table cells. (closes #79)
• Allow mixed nested lists (Already supported in Redcloth).
• Improve detection of open quotes in situations like ["(Berk). Hilton"] (where the open quote was previously was incorrectly detected encoded).
• Fix a problem with links followed by ‘:’, ‘;’ or ‘?’ like Do you like "cheese":/cheese? where the ‘?’ becomes part of the href rather than a ‘?’ at the end of the sentence. This happens on platforms where PCRE has unicode support.
• Removal of leading \t from generated paragraphs & better indentation of generated lists in the HTML (closes #90).
• New method textileEncode(). This is preferred to calling textileThis() with the $encode flag.
• PSR-0, PSR-1 & PSR-2 conformity added.
  1. Split class Textile into classes Parser, DataBag & Tag and moved them into src/textile/php-textile directory for PSR-0.
  2. Unified method names & coding styles according to PSR-1 & PSR-2.
  3. Switched from using defines to explicit set methods; setSymbol() & setRelativeImagePrefix().
  4. Added visibility controls to all properties and methods.
• Dropped textile’s PHP4 heritage and moved over to using a __construct() method.

• Add sftp, callto, tel and file schemes to the URI whitelist in unrestricted mode.
• Support international format tel URIs via linkrefs (link aliases).
• Extend linkrefs to all available URI schemes in unrestricted mode.
• Reverted looser matching of list-like structures as it introduced problems in block-level elements that
  can legitimately have literals or other non-lists in them that are similar to textile’s lists.
  See issue #65 for some examples.
• Fixed #61 which caused strong numeric strings at the start of a line to be turned into lists.
• Reverted auto-breaking in table cells as it introduced #71 (breaking lists within table cells).
• Fixed #67 which ran textile within table cells through the glyph routine twice.

• Conditionally use utf8 in span regex pattern. Closes #53.
• Small code cleanups
• Convert \n to <br/> inside table rows.
• Added HTML comment block handling.
• Added ability to control the start attribute and continuation of ordered lists.
• Adds basic Redcloth-style definition list support.
• Add ability to customise footnote refs and anchors.
• Add https protocol to linkrefs.
• Add unicode support for linkref urls.
• Added redcloth style list continuation.
• Loosen recognition of notedefs and notelists.
• Better recognition of lists adjoined to previous text. (This was reverted in 2.4.1 as it caused issues inside block elements like bc. or bq).
• Bugfix: allow apostrophe between ) and a word character.
• Allow notelist refs to be customised.

• Allow multiple classes in block attributes.
• Improve handling of (classA classB#Bad id) blocks.
• Add span $tail fix & support for trailing [ in spans.
• Add doctype to textile constructor & use abbr instead of acronym for html5 doctypes.
• HTML5 doctype extends class rather than use invalid align attribute.
• Allow auto-assigned classes to be output in restricted mode.
• Add support for encoding Unicode characters in links.
• Notelists: fix order of sup and a. Fixes issue #20
• Add simple set of symbols ¤§µ¶†‡•∗∴◊♠♣♥♦ to notelist regex. Requested in #38
• Remove attributes from embedded code tag output by bc.
• Simplify en-dash glyph rule — should fix #50.
• Simplify self-hyperlinked text, remove the scheme for http, https, ftp and mailto link text.

• Fix potential DoS in cleanba().
• Fix the issue where class would eat the note label.
• Sanitise image URLs.
• Allow inline span tags to be applied within non-English quotation marks.
• Allow non-English quotation marks inside inline span tags.
• Allow pipe closure of captions.
• Allow missing closing pipe in colgroups.
• Note-style links can use index 0.
• Encode quotes in restricted mode, rather than improperly leaving them as is.
• Improve lang, style, id and class handling.
• Add rel attributes to linked images.
• Center aligned cells aren’t treated as captions.
• Removed use of deprecated split() function.
• Disallow unsafe block attributes in restricted mode.

This is our first release forked from revision 3359 of Textpattern CMS. Here are the changes since Textile v2.0.0:

• Allow duplicate notelists with different backref characters.
• Properly render empty table cells.
• Add support for glyphs such as fractions, plus-minus and degrees.
• Optimize glyph encoding setup.
• Optimize style attribute processing.
• Less restrictive paragraph breaking.
• Output cleaner inline styles.
• More restrictive apostrophe encoding and matching.
• Remove horizontal and vertical alignment attributes from list elements.
• Lists can use dot terminator.
• Improved table generation: allow linebreaks in table cells, colgroups, thead, tbody and tfoot elements.
• Add auto-numbered notelists.
• Add Textile comment tag. Comments aren’t displayed in the generated markup.
• Add self-links where the URL can be used with the link text ("$":http://example.com).
• Allow glyph parsing across tag boundaries.
• Add definition lists.
• Fix duplicate IDs in footnotes.
• Caps span isn’t added to acronyms.