[http://sf.net/projects/tcl/files/Tcl/8.6.6/tcltk-release-notes-8.6.6.txt/view%|%Released]
July 27, 2016.

**Tcl Changes**

***Changes to Tcl Commands***

****Expanded Syntax / New Options****

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**Tk Changes**
***Changes to Tk Commands***

****Expanded Syntax / New Options****

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**Changes to Bundled Packages**
***Updated packages***

<<categories>> Documentation | Changes in Tcl/Tk