DOC-3224: Update changelog for TinyMCE 8.3.0.

Author: kemister85

modules/ROOT/pages/changelog.adoc

@@ -6,7 +6,37 @@ NOTE: This is the {productname} Community version changelog. For information abo
 
 == xref:8.3.0-release-notes.adoc[8.3.0 - 2025-12-10]
 
-//TODO
+### Added
+* New `removeCommand` to `editorCommands` API to remove existing commands.
+// #TINY-13144
+* New `documents_file_types` option.
+// #TINY-13278
+* New `files_upload_handler` and `link_uploadtab` options in the Link plugin.
+// #TINY-13278
+* New upload tab to the link dialog when `files_upload_handler`, `documents_file_types`, and `link_uploadtab` are all specified.
+// #TINY-13278
+* New options for `dropzone` dialog components: `dropAreaLabel`, `buttonLabel`, `allowedFileTypes` and `allowedFileExtensions`.
+// #TINY-13278
+
+### Improved
+* Accordions can now be opened and closed when the editor is in a read-only state.
+// #TINY-12316
+* An editor notification is now shown when a premium plugin is not allowed for a given license key.
+// #TINY-12937
+
+### Fixed
+* Help Plugin did not contain an entry for the Fullpage HTML plugin.
+// #TINY-13183
+* Accordions could be toggled when the editor was in a disabled state.
+// #TINY-12315
+* Removing a line height sometimes did not remove it from all selected lines.
+// #TINY-13053
+* The `font-size` style on `li` elements was not copied to new list items.
+// #TINY-13224
+* Toolbar split button chevron tooltip is now the same as the main button tooltip unless explicitly set.
+// #TINY-13271
+* Inline formats were not applied to the marker of a list item when its content was a single block element.
+// #TINY-13197
 
 == xref:8.2.2-release-notes.adoc[8.2.2 - 2025-11-13]