Return the first registered implementation that has the desired features, or null if none is found.
"Experimental - subject to change"
|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" |
- An implementation that has the desired features, or
null if this source has none.
- DOM Level 3