DOMImplementation.hasFeature( ): determine whether the implementation supports a feature — DOM Level 1 Core:
The name of the feature for which support is being tested. The set of valid feature names for the DOM Level 2 standard is listed in the table in the Description. Feature names are case-insensitive.
The feature version number for which support is being tested, or
nullor the empty string
""if support for any version of the feature is sufficient. In the Level 2 DOM specification, supported version numbers are 1.0 and 2.0.
true if the
implementation completely supports the specified version of the
otherwise. If no version number is specified, the method returns
true if the implementation
completely supports any version of the specified feature.
The W3C DOM standard is modular, and implementations are not required to implement all modules or features of the standard. This method tests whether a DOM implementation supports a named module of the DOM specification. The availability information for each entry in this DOM reference includes the name of the module. Note that although Internet Explorer 5 and 5.5 include partial support for the DOM Level 1 specification, this important method is not supported before IE 6.
The complete set of module names that may be used as the
feature argument are shown in the