Add `NodeFilter` interface, `NodeIterator` and `TreeWalker` classes. `NodeFilter`: https://developer.mozilla.org/en-US/docs/Web/API/NodeFilter `NodeIterator`: https://developer.mozilla.org/en-US/docs/Web/API/NodeIterator `TreeWalker`: https://developer.mozilla.org/en-US/docs/Web/API/TreeWalker
Add
NodeFilterinterface,NodeIteratorandTreeWalkerclasses.NodeFilter: https://developer.mozilla.org/en-US/docs/Web/API/NodeFilterNodeIterator: https://developer.mozilla.org/en-US/docs/Web/API/NodeIteratorTreeWalker: https://developer.mozilla.org/en-US/docs/Web/API/TreeWalker