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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 8.7b1 arises from the check-in with tag core-8-7-b1.
Highlighted differences between Tk 8.7 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
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