[Constructor(DOMString type, optional EventInit eventInitDict),
 Exposed=(Window,Worker,AudioWorklet)]
interface Event {
  readonly attribute DOMString type;
  readonly attribute EventTarget? target;
  readonly attribute EventTarget? srcElement; // historical
  readonly attribute EventTarget? currentTarget;
  sequence<EventTarget> composedPath();

  const unsigned short NONE = 0;
  const unsigned short CAPTURING_PHASE = 1;
  const unsigned short AT_TARGET = 2;
  const unsigned short BUBBLING_PHASE = 3;
  readonly attribute unsigned short eventPhase;

  undefined stopPropagation();
           attribute boolean cancelBubble; // historical alias of .stopPropagation
  undefined stopImmediatePropagation();

  readonly attribute boolean bubbles;
  readonly attribute boolean cancelable;
           attribute boolean returnValue;  // historical
  undefined preventDefault();
  readonly attribute boolean defaultPrevented;
  readonly attribute boolean composed;

  [Unforgeable] readonly attribute boolean isTrusted;
  readonly attribute DOMHighResTimeStamp timeStamp;

  undefined initEvent(DOMString type, optional boolean bubbles = false, optional boolean cancelable = false); // historical
};

dictionary EventInit {
  boolean bubbles = false;
  boolean cancelable = false;
  boolean composed = false;
};

[Constructor(DOMString type, optional CustomEventInit eventInitDict),
 Exposed=(Window,Worker)]
interface CustomEvent : Event {
  readonly attribute any detail;

  undefined initCustomEvent(DOMString type, optional boolean bubbles = false, optional boolean cancelable = false, optional any detail = null);
};

dictionary CustomEventInit : EventInit {
  any detail = null;
};

[Constructor,
 Exposed=(Window,Worker,AudioWorklet)]
interface EventTarget {
  undefined addEventListener(DOMString type, EventListener? callback, optional (AddEventListenerOptions or boolean) options);
  undefined removeEventListener(DOMString type, EventListener? callback, optional (EventListenerOptions or boolean) options);
  boolean dispatchEvent(Event event);
};

callback interface EventListener {
  undefined handleEvent(Event event);
};

dictionary EventListenerOptions {
  boolean capture = false;
};

dictionary AddEventListenerOptions : EventListenerOptions {
  boolean passive = false;
  boolean once = false;
};

[Constructor,
 Exposed=(Window,Worker)]
interface AbortController {
  [SameObject] readonly attribute AbortSignal signal;

  undefined abort();
};

[Exposed=(Window,Worker)]
interface AbortSignal : EventTarget {
  readonly attribute boolean aborted;

  attribute EventHandler onabort;
};

interface mixin NonElementParentNode {
  Element? getElementById(DOMString elementId);
};
Document includes NonElementParentNode;
DocumentFragment includes NonElementParentNode;

interface mixin DocumentOrShadowRoot {
};
Document includes DocumentOrShadowRoot;
ShadowRoot includes DocumentOrShadowRoot;

interface mixin ParentNode {
  [SameObject] readonly attribute HTMLCollection children;
  readonly attribute Element? firstElementChild;
  readonly attribute Element? lastElementChild;
  readonly attribute unsigned long childElementCount;

  [CEReactions, Unscopable] undefined prepend((Node or DOMString)... nodes);
  [CEReactions, Unscopable] undefined append((Node or DOMString)... nodes);

  Element? querySelector(DOMString selectors);
  [NewObject] NodeList querySelectorAll(DOMString selectors);
};
Document includes ParentNode;
DocumentFragment includes ParentNode;
Element includes ParentNode;

interface mixin NonDocumentTypeChildNode {
  readonly attribute Element? previousElementSibling;
  readonly attribute Element? nextElementSibling;
};
Element includes NonDocumentTypeChildNode;
CharacterData includes NonDocumentTypeChildNode;

interface mixin ChildNode {
  [CEReactions, Unscopable] undefined before((Node or DOMString)... nodes);
  [CEReactions, Unscopable] undefined after((Node or DOMString)... nodes);
  [CEReactions, Unscopable] undefined replaceWith((Node or DOMString)... nodes);
  [CEReactions, Unscopable] undefined remove();
};
DocumentType includes ChildNode;
Element includes ChildNode;
CharacterData includes ChildNode;

interface mixin Slotable {
  readonly attribute HTMLSlotElement? assignedSlot;
};
Element includes Slotable;
Text includes Slotable;

[Exposed=Window]
interface NodeList {
  getter Node? item(unsigned long index);
  readonly attribute unsigned long length;
  iterable<Node>;
};

[Exposed=Window, LegacyUnenumerableNamedProperties]
interface HTMLCollection {
  readonly attribute unsigned long length;
  getter Element? item(unsigned long index);
  getter Element? namedItem(DOMString name);
};

[Constructor(MutationCallback callback),
 Exposed=Window]
interface MutationObserver {
  undefined observe(Node target, optional MutationObserverInit options);
  undefined disconnect();
  sequence<MutationRecord> takeRecords();
};

callback MutationCallback = undefined (sequence<MutationRecord> mutations, MutationObserver observer);

dictionary MutationObserverInit {
  boolean childList = false;
  boolean attributes;
  boolean characterData;
  boolean subtree = false;
  boolean attributeOldValue;
  boolean characterDataOldValue;
  sequence<DOMString> attributeFilter;
};

[Exposed=Window]
interface MutationRecord {
  readonly attribute DOMString type;
  [SameObject] readonly attribute Node target;
  [SameObject] readonly attribute NodeList addedNodes;
  [SameObject] readonly attribute NodeList removedNodes;
  readonly attribute Node? previousSibling;
  readonly attribute Node? nextSibling;
  readonly attribute DOMString? attributeName;
  readonly attribute DOMString? attributeNamespace;
  readonly attribute DOMString? oldValue;
};

[Exposed=Window]
interface Node : EventTarget {
  const unsigned short ELEMENT_NODE = 1;
  const unsigned short ATTRIBUTE_NODE = 2;
  const unsigned short TEXT_NODE = 3;
  const unsigned short CDATA_SECTION_NODE = 4;
  const unsigned short ENTITY_REFERENCE_NODE = 5; // historical
  const unsigned short ENTITY_NODE = 6; // historical
  const unsigned short PROCESSING_INSTRUCTION_NODE = 7;
  const unsigned short COMMENT_NODE = 8;
  const unsigned short DOCUMENT_NODE = 9;
  const unsigned short DOCUMENT_TYPE_NODE = 10;
  const unsigned short DOCUMENT_FRAGMENT_NODE = 11;
  const unsigned short NOTATION_NODE = 12; // historical
  readonly attribute unsigned short nodeType;
  readonly attribute DOMString nodeName;

  readonly attribute USVString baseURI;

  readonly attribute boolean isConnected;
  readonly attribute Document? ownerDocument;
  Node getRootNode(optional GetRootNodeOptions options);
  readonly attribute Node? parentNode;
  readonly attribute Element? parentElement;
  boolean hasChildNodes();
  [SameObject] readonly attribute NodeList childNodes;
  readonly attribute Node? firstChild;
  readonly attribute Node? lastChild;
  readonly attribute Node? previousSibling;
  readonly attribute Node? nextSibling;

  [CEReactions] attribute DOMString? nodeValue;
  [CEReactions] attribute DOMString? textContent;
  [CEReactions] undefined normalize();

  [CEReactions, NewObject] Node cloneNode(optional boolean deep = false);
  boolean isEqualNode(Node? otherNode);
  boolean isSameNode(Node? otherNode); // historical alias of ===

  const unsigned short DOCUMENT_POSITION_DISCONNECTED = 0x01;
  const unsigned short DOCUMENT_POSITION_PRECEDING = 0x02;
  const unsigned short DOCUMENT_POSITION_FOLLOWING = 0x04;
  const unsigned short DOCUMENT_POSITION_CONTAINS = 0x08;
  const unsigned short DOCUMENT_POSITION_CONTAINED_BY = 0x10;
  const unsigned short DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC = 0x20;
  unsigned short compareDocumentPosition(Node other);
  boolean contains(Node? other);

  DOMString? lookupPrefix(DOMString? namespace);
  DOMString? lookupNamespaceURI(DOMString? prefix);
  boolean isDefaultNamespace(DOMString? namespace);

  [CEReactions] Node insertBefore(Node node, Node? child);
  [CEReactions] Node appendChild(Node node);
  [CEReactions] Node replaceChild(Node node, Node child);
  [CEReactions] Node removeChild(Node child);
};

dictionary GetRootNodeOptions {
  boolean composed = false;
};

[Constructor,
 Exposed=Window]
interface Document : Node {
  [SameObject] readonly attribute DOMImplementation implementation;
  readonly attribute USVString URL;
  readonly attribute USVString documentURI;
  readonly attribute USVString origin;
  readonly attribute DOMString compatMode;
  readonly attribute DOMString characterSet;
  readonly attribute DOMString charset; // historical alias of .characterSet
  readonly attribute DOMString inputEncoding; // historical alias of .characterSet
  readonly attribute DOMString contentType;

  readonly attribute DocumentType? doctype;
  readonly attribute Element? documentElement;
  HTMLCollection getElementsByTagName(DOMString qualifiedName);
  HTMLCollection getElementsByTagNameNS(DOMString? namespace, DOMString localName);
  HTMLCollection getElementsByClassName(DOMString classNames);

  [CEReactions, NewObject] Element createElement(DOMString localName, optional (DOMString or ElementCreationOptions) options);
  [CEReactions, NewObject] Element createElementNS(DOMString? namespace, DOMString qualifiedName, optional (DOMString or ElementCreationOptions) options);
  [NewObject] DocumentFragment createDocumentFragment();
  [NewObject] Text createTextNode(DOMString data);
  [NewObject] CDATASection createCDATASection(DOMString data);
  [NewObject] Comment createComment(DOMString data);
  [NewObject] ProcessingInstruction createProcessingInstruction(DOMString target, DOMString data);

  [CEReactions, NewObject] Node importNode(Node node, optional boolean deep = false);
  [CEReactions] Node adoptNode(Node node);

  [NewObject] Attr createAttribute(DOMString localName);
  [NewObject] Attr createAttributeNS(DOMString? namespace, DOMString qualifiedName);

  [NewObject] Event createEvent(DOMString interface);

  [NewObject] Range createRange();

  // NodeFilter.SHOW_ALL = 0xFFFFFFFF
  [NewObject] NodeIterator createNodeIterator(Node root, optional unsigned long whatToShow = 0xFFFFFFFF, optional NodeFilter? filter = null);
  [NewObject] TreeWalker createTreeWalker(Node root, optional unsigned long whatToShow = 0xFFFFFFFF, optional NodeFilter? filter = null);
};

[Exposed=Window]
interface XMLDocument : Document {};

dictionary ElementCreationOptions {
  DOMString is;
};

[Exposed=Window]
interface DOMImplementation {
  [NewObject] DocumentType createDocumentType(DOMString qualifiedName, DOMString publicId, DOMString systemId);
  [NewObject] XMLDocument createDocument(DOMString? namespace, [TreatNullAs=EmptyString] DOMString qualifiedName, optional DocumentType? doctype = null);
  [NewObject] Document createHTMLDocument(optional DOMString title);

  boolean hasFeature(); // useless; always returns true
};

[Exposed=Window]
interface DocumentType : Node {
  readonly attribute DOMString name;
  readonly attribute DOMString publicId;
  readonly attribute DOMString systemId;
};

[Constructor,
 Exposed=Window]
interface DocumentFragment : Node {
};

[Exposed=Window]
interface ShadowRoot : DocumentFragment {
  readonly attribute ShadowRootMode mode;
  readonly attribute Element host;
};

enum ShadowRootMode { "open", "closed" };

[Exposed=Window]
interface Element : Node {
  readonly attribute DOMString? namespaceURI;
  readonly attribute DOMString? prefix;
  readonly attribute DOMString localName;
  readonly attribute DOMString tagName;

  [CEReactions] attribute DOMString id;
  [CEReactions] attribute DOMString className;
  [SameObject, PutForwards=value] readonly attribute DOMTokenList classList;
  [CEReactions, Unscopable] attribute DOMString slot;

  boolean hasAttributes();
  [SameObject] readonly attribute NamedNodeMap attributes;
  sequence<DOMString> getAttributeNames();
  DOMString? getAttribute(DOMString qualifiedName);
  DOMString? getAttributeNS(DOMString? namespace, DOMString localName);
  [CEReactions] undefined setAttribute(DOMString qualifiedName, DOMString value);
  [CEReactions] undefined setAttributeNS(DOMString? namespace, DOMString qualifiedName, DOMString value);
  [CEReactions] undefined removeAttribute(DOMString qualifiedName);
  [CEReactions] undefined removeAttributeNS(DOMString? namespace, DOMString localName);
  boolean hasAttribute(DOMString qualifiedName);
  boolean hasAttributeNS(DOMString? namespace, DOMString localName);

  Attr? getAttributeNode(DOMString qualifiedName);
  Attr? getAttributeNodeNS(DOMString? namespace, DOMString localName);
  [CEReactions] Attr? setAttributeNode(Attr attr);
  [CEReactions] Attr? setAttributeNodeNS(Attr attr);
  [CEReactions] Attr removeAttributeNode(Attr attr);

  ShadowRoot attachShadow(ShadowRootInit init);
  readonly attribute ShadowRoot? shadowRoot;

  Element? closest(DOMString selectors);
  boolean matches(DOMString selectors);
  boolean webkitMatchesSelector(DOMString selectors); // historical alias of .matches

  HTMLCollection getElementsByTagName(DOMString qualifiedName);
  HTMLCollection getElementsByTagNameNS(DOMString? namespace, DOMString localName);
  HTMLCollection getElementsByClassName(DOMString classNames);

  [CEReactions] Element? insertAdjacentElement(DOMString where, Element element); // historical
  undefined insertAdjacentText(DOMString where, DOMString data); // historical
};

dictionary ShadowRootInit {
  required ShadowRootMode mode;
};

[Exposed=Window,
 LegacyUnenumerableNamedProperties]
interface NamedNodeMap {
  readonly attribute unsigned long length;
  getter Attr? item(unsigned long index);
  getter Attr? getNamedItem(DOMString qualifiedName);
  Attr? getNamedItemNS(DOMString? namespace, DOMString localName);
  [CEReactions] Attr? setNamedItem(Attr attr);
  [CEReactions] Attr? setNamedItemNS(Attr attr);
  [CEReactions] Attr removeNamedItem(DOMString qualifiedName);
  [CEReactions] Attr removeNamedItemNS(DOMString? namespace, DOMString localName);
};

[Exposed=Window]
interface Attr : Node {
  readonly attribute DOMString? namespaceURI;
  readonly attribute DOMString? prefix;
  readonly attribute DOMString localName;
  readonly attribute DOMString name;
  [CEReactions] attribute DOMString value;

  readonly attribute Element? ownerElement;

  readonly attribute boolean specified; // useless; always returns true
};

[Exposed=Window]
interface CharacterData : Node {
  attribute [TreatNullAs=EmptyString] DOMString data;
  readonly attribute unsigned long length;
  DOMString substringData(unsigned long offset, unsigned long count);
  undefined appendData(DOMString data);
  undefined insertData(unsigned long offset, DOMString data);
  undefined deleteData(unsigned long offset, unsigned long count);
  undefined replaceData(unsigned long offset, unsigned long count, DOMString data);
};

[Constructor(optional DOMString data = ""),
 Exposed=Window]
interface Text : CharacterData {
  [NewObject] Text splitText(unsigned long offset);
  readonly attribute DOMString wholeText;
};

[Exposed=Window]
interface CDATASection : Text {
};

[Exposed=Window]
interface ProcessingInstruction : CharacterData {
  readonly attribute DOMString target;
};

[Constructor(optional DOMString data = ""),
 Exposed=Window]
interface Comment : CharacterData {
};

[Exposed=Window]
interface AbstractRange {
  readonly attribute Node startContainer;
  readonly attribute unsigned long startOffset;
  readonly attribute Node endContainer;
  readonly attribute unsigned long endOffset;
  readonly attribute boolean collapsed;
};

[Exposed=Window]
interface StaticRange : AbstractRange {
};

[Constructor,
 Exposed=Window]
interface Range : AbstractRange {
  readonly attribute Node commonAncestorContainer;

  undefined setStart(Node node, unsigned long offset);
  undefined setEnd(Node node, unsigned long offset);
  undefined setStartBefore(Node node);
  undefined setStartAfter(Node node);
  undefined setEndBefore(Node node);
  undefined setEndAfter(Node node);
  undefined collapse(optional boolean toStart = false);
  undefined selectNode(Node node);
  undefined selectNodeContents(Node node);

  const unsigned short START_TO_START = 0;
  const unsigned short START_TO_END = 1;
  const unsigned short END_TO_END = 2;
  const unsigned short END_TO_START = 3;
  short compareBoundaryPoints(unsigned short how, Range sourceRange);

  [CEReactions] undefined deleteContents();
  [CEReactions, NewObject] DocumentFragment extractContents();
  [CEReactions, NewObject] DocumentFragment cloneContents();
  [CEReactions] undefined insertNode(Node node);
  [CEReactions] undefined surroundContents(Node newParent);

  [NewObject] Range cloneRange();
  undefined detach();

  boolean isPointInRange(Node node, unsigned long offset);
  short comparePoint(Node node, unsigned long offset);

  boolean intersectsNode(Node node);

  stringifier;
};

[Exposed=Window]
interface NodeIterator {
  [SameObject] readonly attribute Node root;
  readonly attribute Node referenceNode;
  readonly attribute boolean pointerBeforeReferenceNode;
  readonly attribute unsigned long whatToShow;
  readonly attribute NodeFilter? filter;

  Node? nextNode();
  Node? previousNode();

  undefined detach();
};

[Exposed=Window]
interface TreeWalker {
  [SameObject] readonly attribute Node root;
  readonly attribute unsigned long whatToShow;
  readonly attribute NodeFilter? filter;
           attribute Node currentNode;

  Node? parentNode();
  Node? firstChild();
  Node? lastChild();
  Node? previousSibling();
  Node? nextSibling();
  Node? previousNode();
  Node? nextNode();
};

[Exposed=Window]
callback interface NodeFilter {
  // Constants for acceptNode()
  const unsigned short FILTER_ACCEPT = 1;
  const unsigned short FILTER_REJECT = 2;
  const unsigned short FILTER_SKIP = 3;

  // Constants for whatToShow
  const unsigned long SHOW_ALL = 0xFFFFFFFF;
  const unsigned long SHOW_ELEMENT = 0x1;
  const unsigned long SHOW_ATTRIBUTE = 0x2;
  const unsigned long SHOW_TEXT = 0x4;
  const unsigned long SHOW_CDATA_SECTION = 0x8;
  const unsigned long SHOW_ENTITY_REFERENCE = 0x10; // historical
  const unsigned long SHOW_ENTITY = 0x20; // historical
  const unsigned long SHOW_PROCESSING_INSTRUCTION = 0x40;
  const unsigned long SHOW_COMMENT = 0x80;
  const unsigned long SHOW_DOCUMENT = 0x100;
  const unsigned long SHOW_DOCUMENT_TYPE = 0x200;
  const unsigned long SHOW_DOCUMENT_FRAGMENT = 0x400;
  const unsigned long SHOW_NOTATION = 0x800; // historical

  unsigned short acceptNode(Node node);
};

[Exposed=Window]
interface DOMTokenList {
  readonly attribute unsigned long length;
  getter DOMString? item(unsigned long index);
  boolean contains(DOMString token);
  [CEReactions] undefined add(DOMString... tokens);
  [CEReactions] undefined remove(DOMString... tokens);
  [CEReactions] boolean toggle(DOMString token, optional boolean force);
  [CEReactions] boolean replace(DOMString token, DOMString newToken);
  boolean supports(DOMString token);
  [CEReactions] stringifier attribute DOMString value;
  iterable<DOMString>;
};