Breaking changes:

• markdown-do supports following link GH-666
  This changes behavior of markdown-do at table

New features:

• Introduce markdown-mouse-follow-link variable GH-290
• Option to define a markdown-link-make-text-function function
  to automatically define a default link text before prompting the user.
• Option to inhibit the prompt for a tooltip text via
  markdown-disable-tooltip-prompt.
• Introduce markdown-ordered-list-enumeration variable GH-587
• Search wiki link under project
• Add markdown-insert-foldable-block function GH-598
• Add markdown-table-align-p flag GH-625
  Control table alignment after table operation
• Support highlighting syntax like Obsidian, Quilt. GH-652

Improvements:

• Correct indirect buffer's indentation in markdown-edit-code-block GH-375
• Cleanup test code
• Strip query parameters from local file name at displaying inline images GH-511
• Improve forward/backward sentences which are wrapped markup characters GH-517
• Improve fontification for nested meta data GH-476
• markdown-cycle accepts universal-argument like org-cycle GH-530
• Improve mode check for derived modes GH-532
• Improve for file which contains many comments GH-536
• Improve for file which contains many pre blocks GH-512
• Enable flyspell check at yaml metadataGH-560
• Clean up Makefile
• Support to display local image with percent encoding file path
• Add ability to resize inline image display (markdown-toggle-inline-images) without Imagemagick installed in the computer (emulating Org Mode)
• Support including braces around the language specification in GFM code blocks
• Improve markdown-insert-{bold,italic} when region starts with spacesGH-613
• Disable buffer-read-only if possible when markdown-mode is called GH-622
• Generate the defface via a macro rather than a function.
• Memoize markdown--first-displayable to avoid performance
  problems.
• Allow the use of add-function on
  markdown-table-at-point-p-function.
• Comment out redundant bindings and use the more standard RET
  name for C-m.
• Give markdown-table-at-point-p-function a non-nil default.
  Simplify markdown-table-at-point-p accordingly.
• Auto set sh-shell when markdown-edit-code-block enter indirect buffer with sh-mode
• Add value check and avoid raising the exception at markdown-edit-code-block GH-663
• Add NonGNU ELPA badge to README and website
• Support plus/negative(also Unicode minus sign) exponent in super script GH-346

Bug fixes:

• Fix issue with nil being returned from markdown-imenu-create-nested-index [GH-578][]
• Fix remaining flyspell overlay in code block or comment issue GH-311
• Fix inline URL regular expression which starts/ends with spaces GH-514
• Fix GFM italic fontification for one character GH-524
• Fix markdown-table-forward-cell at last column issue GH-522
• Fix GFM bold fontification with underscore issue GH-525
• Fix wrong fontification words between strong markups GH-534
• Fix wrong italic fontification just after code block GH-548
• Fix too indended list face issue GH-569
• Fix creating imenu index issue when there is no level-1 header tooGH-571
• Fix highlighting consecutive HTML commentsGH-584
• Fix markdown-follow-thing-at-point failing on subdir search GH-590
• Fix markdown-table-backward-cell so it always goes back a single cell
• Fix markdown-table-align to detect delimiters surrounded by spaces
• Fix customization for markdown-mouse-follow-link and
  markdown-table-align-p
• Fix accessing locations beyond point-max in
  markdown-syntax-propertize
• Set syntax-propertize-extend-region-functions buffer-locally
  instead of globally
• Modify only the buffer-local part of
  syntax-propertize-extend-region-functions.
• Fix list highlighting issue in code block GH-631
• Fix exception when inserting code block at end of buffer GH-634
• Fix table operations when table column contains escaped vertical bars GH-635
• Fix issue that executing markdown-table-sort-lines via menu-bar with older Emacs(< 28) GH-641
• Fix wrong markdown table command issue in menu GH-639
• Fix table conversion issue GH-639
• Fix fill paragraph issue with setext heading GH-638
• Fix line break highlighting issue at end of buffer GH-621
• Fix URL highlighting which contains comma or parentheis GH-649
• Fix eldoc function issue with markdown-toggle-url-hiding GH-674
  Thanks to Ta Quang Trung for a patch
• Fix markdown-enable-math exception issue GH-676
• Fix markdown-marginalize-headers rendering in tty mode GH-677
• Fix table and list fontification GH-680
• Fix invalid code block highlighting GH-684