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This class holds the list of registered DOMImplementations.
 
Implementation or application can register DOMImplementationSource to the registry, and then can query DOMImplementation based on a list of requested features.
 
 
This provides an application with an implementation independent starting point.
 
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See also: 
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DOMImplementation , DOMImplementationSource 
 
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Since: 
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DOM Level 3 
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