A [Ttk] (i.e. theme-able) [scale] [widget].
    :   http://www.tcl.tk/man/tcl8.5/TkCmd/ttk_scale.htm

Existed in 8.5.0, but was first documented in 8.5.2.

''Warning!'' The API of this widget may change in the future.
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%| [Category Widget] |%
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