DOMImplementation.hasFeature() - Web APIs
the domimplementation.hasfeature() method returns a boolean flag indicating if a given feature is supported.
... always return true, where the functionality was accurate and in use.
... version a domstring representing the version of the specification defining the feature.
...And 2 more matches

Index - Web APIs
which can either be used with domimplementation.createdocument upon document creation or can be put into the document via methods like node.insertbefore() or node.replacechild().
...n be put into the document via methods like node.insertbefore() or node.replacechild().

DOMImplementation - Web APIs
object is returned by the document.implementation property.

requiredFeatures - SVG: Scalable Vector Graphics
ing or empty string value is given to attribute requiredfeatures, the attribute is evaluate to false.