is an option for Dynamic, DynamicModule, Manipulate, and related constructs that specifies an expression to be evaluated when the construct can no longer be displayed or used.


  • The typical usage is Deinitialization:>expr.
  • Deinitialization is typically done when the cell containing a construct is deleted, or when the notebook containing it is closed.
  • Deinitialization will never be performed unless initialization has previously been performed.
  • Deinitialization may be delayed if, for example, a construct appears in an invisible location such as the clipboard.

ExamplesExamplesopen allclose all

Basic Examples  (3)Basic Examples  (3)

Choose a color and create the colored disk when the window is closed:

Temporarily change the background of a notebook:

Track and display how long a window was viewed:

Introduced in 2007
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