deprecate Node.isSameNode Node.isSupported. add missing Node.contains

https://developer.mozilla.org/en-US/docs/Web/API/Node.isSameNode
https://developer.mozilla.org/en-US/docs/Web/API/Node.isSupported
https://developer.mozilla.org/en-US/docs/Web/API/Node.contains
`@deprecated` should be a real annotation, not part of the comment. Otherwise it's not really deprecated.