(PHP 5)
DOMNode::isSupported — Checks if feature is supported for specified version
Checks if the asked feature is supported for the specified version.
The feature to test. See the example of DOMImplementation::hasFeature() for a list of features.
The version number of the feature to test.
Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки.