Returns true if the browser supports the given extension, specified by a URI.
Returns true if the browser supports the given extension, specified by a URI.
MDN
Corresponds to attribute requiredExtensions on the given element.
Corresponds to attribute requiredExtensions on the given element.
MDN
Corresponds to attribute requiredFeatures on the given element.
Corresponds to attribute requiredFeatures on the given element.
MDN
Corresponds to attribute systemLanguage on the given element.
Corresponds to attribute systemLanguage on the given element.
MDN
Interface SVGTests defines an interface which applies to all elements which have attributes requiredFeatures, requiredExtensions and systemLanguage.
MDN