Overlay Change History
======================
3.10.3
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* No changes.
3.10.2
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* No changes.
3.10.1
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* No changes.
3.10.0
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* No changes.
3.9.1
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* No changes.
3.9.0
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* No changes.
3.8.1
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* No changes.
3.8.0
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* No changes.
3.7.3
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* No changes.
3.7.2
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* No changes.
3.7.1
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* No changes.
3.7.0
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* No changes.
3.6.0
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* No changes.
3.5.1
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* No changes.
3.5.0
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* No changes, see Widget and extensions for changes to dependencies.
3.4.1
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* No changes, see Widget and extensions for changes to dependencies.
3.4.0
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* No changes, see Widget and extensions for changes to dependencies.
3.3.0
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* No changes, see Widget and extensions for changes to dependencies.
3.2.0
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* No changes, see Widget and extensions for changes to dependencies.
3.1.1
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* No changes.
3.1.0
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* Added WidgetConstrain support to the packaged Overlay class.
* Fixed centering when content is set in constructor.
3.0.0
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* Initial release.
* Modified progressive enhancement use case, to use Document Fragments instead
of `innerHTML` to preserve event listeners.
* Fixed use of `centered`, `x` and `y` in the constructor. These all needed
`lazyAdd` configuration since they had setters which modified other
attribute state.