The KeyboardEvent.metaKey read-only property returning a Boolean that indicates if the Meta key was pressed (true) or not (false) when the event occurred. Some operating systems may intercept the key so it is never detected.
The Node.isSupported()returns a Boolean flag containing the result of a test whether the DOM implementation implements a specific feature and this feature is supported by the specific node.
The SVGAnimatedPoints interface supports elements which have a points attribute which holds a list of coordinate values and which support the ability to animate that attribute.