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+The source code for Tk is managed by fossil.  Tk developers coordinate all
+changes to the Tk source code at
+
+> [Tk Source Code](https://core.tcl-lang.org/tk/)
+
+Release Tk 9.0b2 arises from the check-in with tag core-9-0-b2.
+
+Highlighted differences between Tk 9.0 and Tk 8.6 are summarized below,
+with focus on changes important to programmers using the Tk library and
+writing Tcl scripts containing Tk commands.
+
+## Many improvements to use of platform features and conventions.
+ - Built-in widgets and themes are scaling-aware.
+ - Improved support of two-finger gestures, where available
+ - The `tk windowingsystem` "aqua" needs macOS 10.10 or later
+
+## New commands and options
+ - `tk sysnotify`: access to the OS notifications system
+ - `tk systray`: access to the OS tray facility
+ - `tk print`: access to the OS printing facility
+
+## Widget options
+ - New `ttk::progressbar` option: **-text**
+ - `$frame ... -backgroundimage $img -tile $bool`
+ - `$menu id`, `$menu add|insert ... ?$id? ...`
+ - `$image get ... -withalpha ...`
+ - All indices now accept the forms **end**, **end-int**, **int+|-int**
+
+## Improved widget appearance
+ - `ttk::notebook` with nondefault tab positions
+
+## Images
+ - Partial SVG support
+ - Read/write access to photo image metadata
+