Widget Stack Change History
===========================
3.4.1
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* The shim element is now sizing correctly the first time a widget is shown
after it was instantiated with the `visible` Attribute set to `false`. Note:
The shim element is only used with IE 6 by default. [Ticket #2529127]
3.4.0
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* No changes.
3.3.0
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* No changes.
3.2.0
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* No changes.
3.1.1
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* No changes.
3.1.0
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* No changes.
3.0.0
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* Initial release.
* Recreate iframe shim from `TEMPLATE` for each instance, instead of cloning a
class level cached Node instance, so that `ownerDocument` can be set to
match the `boundingBox`.