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Return the first registered implementation that has the desired features, or null if none is found.
 
 
"Experimental - subject to change" - 
Parameters: 
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| features  | 
A string that specifies which features are required. This is a space separated list in which each feature is specified by its name optionally followed by a space and a version number. This is something like: "XML 1.0 Traversal 2.0"  |  
 
 
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Returns: 
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An implementation that has the desired features, or 
null if this source has none.  
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Since: 
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DOM Level 3 
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