Node

DOM dom

Baseline: Widely available on the web, in every major browser since Jul 2015, and long enough to count on (since Jan 2018).

niso: No WPT tests. WPT maps no test to it. WPT results recorded at f3b4fa8, 2026-11-10; web-features 3.45.0. WPT tests · niso's support · Attr, CDATASection, CharacterData, Comment

Node is an interface in idl/dom.webidl, inheriting EventTarget, exposed in Window. What it does is on MDN; this page says what niso has of it.

Status

The web features its members belong to, each with its Baseline status on the web and how much of the feature’s WPT suite passes in niso (see Web platform support).

Feature	On the web	In niso	Members
DOM	Widely available	No WPT tests WPT maps no test to it	28
Shadow DOM	Widely available	Partial 3.4% 26 of 756 subtests pass	2

Members

xmlSerialization()

operation native code only

[NisoNative] DOMString xmlSerialization(boolean requireWellFormed);

int32_t niso_node_xml_serialization(niso_dom* dom, niso_handle self, bool require_well_formed, niso_str* out);

The node’s XML serialization (DOM Parsing’s “produce an XML serialization”); an InvalidStateError if requireWellFormed is true and the result wouldn’t be well-formed XML.

ELEMENT_NODE

const

const unsigned short ELEMENT_NODE = 1;

ATTRIBUTE_NODE

const

const unsigned short ATTRIBUTE_NODE = 2;

TEXT_NODE

const

const unsigned short TEXT_NODE = 3;

CDATA_SECTION_NODE

const

const unsigned short CDATA_SECTION_NODE = 4;

ENTITY_REFERENCE_NODE

const

const unsigned short ENTITY_REFERENCE_NODE = 5;

ENTITY_NODE

const

const unsigned short ENTITY_NODE = 6;

PROCESSING_INSTRUCTION_NODE

const

const unsigned short PROCESSING_INSTRUCTION_NODE = 7;

COMMENT_NODE

const

const unsigned short COMMENT_NODE = 8;

DOCUMENT_NODE

const

const unsigned short DOCUMENT_NODE = 9;

DOCUMENT_TYPE_NODE

const

const unsigned short DOCUMENT_TYPE_NODE = 10;

DOCUMENT_FRAGMENT_NODE

const

const unsigned short DOCUMENT_FRAGMENT_NODE = 11;

NOTATION_NODE

const

const unsigned short NOTATION_NODE = 12;

nodeType

attribute

readonly attribute unsigned short nodeType;

int32_t niso_node_get_node_type(niso_dom* dom, niso_handle self, uint16_t* out);

nodeName

attribute

readonly attribute DOMString nodeName;

int32_t niso_node_get_node_name(niso_dom* dom, niso_handle self, niso_str* out);

baseURI

attribute

readonly attribute USVString baseURI;

int32_t niso_node_get_base_uri(niso_dom* dom, niso_handle self, niso_str* out);

isConnected

attribute Shadow DOM: Partial 3.4%

readonly attribute boolean isConnected;

int32_t niso_node_get_is_connected(niso_dom* dom, niso_handle self, bool* out);

ownerDocument

attribute

readonly attribute Document? ownerDocument;

int32_t niso_node_get_owner_document(niso_dom* dom, niso_handle self, niso_handle* out);

getRootNode()

operation Shadow DOM: Partial 3.4%

Node getRootNode();

int32_t niso_node_get_root_node(niso_dom* dom, niso_handle self, niso_handle* out);

parentNode

attribute

readonly attribute Node? parentNode;

int32_t niso_node_get_parent_node(niso_dom* dom, niso_handle self, niso_handle* out);

parentElement

attribute

readonly attribute Element? parentElement;

int32_t niso_node_get_parent_element(niso_dom* dom, niso_handle self, niso_handle* out);

hasChildNodes()

operation

boolean hasChildNodes();

int32_t niso_node_has_child_nodes(niso_dom* dom, niso_handle self, bool* out);

childNodes

attribute

readonly attribute NodeList childNodes;

int32_t niso_node_get_child_nodes(niso_dom* dom, niso_handle self, niso_handles* out);

firstChild

attribute

readonly attribute Node? firstChild;

int32_t niso_node_get_first_child(niso_dom* dom, niso_handle self, niso_handle* out);

lastChild

attribute

readonly attribute Node? lastChild;

int32_t niso_node_get_last_child(niso_dom* dom, niso_handle self, niso_handle* out);

previousSibling

attribute

readonly attribute Node? previousSibling;

int32_t niso_node_get_previous_sibling(niso_dom* dom, niso_handle self, niso_handle* out);

nextSibling

attribute

readonly attribute Node? nextSibling;

int32_t niso_node_get_next_sibling(niso_dom* dom, niso_handle self, niso_handle* out);

nodeValue

attribute

attribute DOMString? nodeValue;

int32_t niso_node_get_node_value(niso_dom* dom, niso_handle self, niso_str* out);
int32_t niso_node_set_node_value(niso_dom* dom, niso_handle self, const char* value, size_t value_len);

textContent

attribute

attribute DOMString? textContent;

int32_t niso_node_get_text_content(niso_dom* dom, niso_handle self, niso_str* out);
int32_t niso_node_set_text_content(niso_dom* dom, niso_handle self, const char* value, size_t value_len);

normalize()

operation

undefined normalize();

int32_t niso_node_normalize(niso_dom* dom, niso_handle self);

cloneNode()

operation

Node cloneNode(optional boolean subtree = false);

int32_t niso_node_clone_node(niso_dom* dom, niso_handle self, bool subtree, niso_handle* out);

isEqualNode()

operation

boolean isEqualNode(Node? otherNode);

int32_t niso_node_is_equal_node(niso_dom* dom, niso_handle self, niso_handle other_node, bool* out);

isSameNode()

operation

boolean isSameNode(Node? otherNode);

int32_t niso_node_is_same_node(niso_dom* dom, niso_handle self, niso_handle other_node, bool* out);

DOCUMENT_POSITION_DISCONNECTED

const

const unsigned short DOCUMENT_POSITION_DISCONNECTED = 0x01;

DOCUMENT_POSITION_PRECEDING

const

const unsigned short DOCUMENT_POSITION_PRECEDING = 0x02;

DOCUMENT_POSITION_FOLLOWING

const

const unsigned short DOCUMENT_POSITION_FOLLOWING = 0x04;

DOCUMENT_POSITION_CONTAINS

const

const unsigned short DOCUMENT_POSITION_CONTAINS = 0x08;

DOCUMENT_POSITION_CONTAINED_BY

const

const unsigned short DOCUMENT_POSITION_CONTAINED_BY = 0x10;

DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC

const

const unsigned short DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC = 0x20;

compareDocumentPosition()

operation

unsigned short compareDocumentPosition(Node other);

int32_t niso_node_compare_document_position(niso_dom* dom, niso_handle self, niso_handle other, uint16_t* out);

contains()

operation

boolean contains(Node? other);

int32_t niso_node_contains(niso_dom* dom, niso_handle self, niso_handle other, bool* out);

lookupPrefix()

operation

DOMString? lookupPrefix(DOMString? namespace);

int32_t niso_node_lookup_prefix(niso_dom* dom, niso_handle self, const char* namespace_, size_t namespace__len, niso_str* out);

lookupNamespaceURI()

operation

DOMString? lookupNamespaceURI(DOMString? prefix);

int32_t niso_node_lookup_namespace_uri(niso_dom* dom, niso_handle self, const char* prefix, size_t prefix_len, niso_str* out);

isDefaultNamespace()

operation

boolean isDefaultNamespace(DOMString? namespace);

int32_t niso_node_is_default_namespace(niso_dom* dom, niso_handle self, const char* namespace_, size_t namespace__len, bool* out);

insertBefore()

operation

Node insertBefore(Node node, Node? child);

int32_t niso_node_insert_before(niso_dom* dom, niso_handle self, niso_handle node, niso_handle child, niso_handle* out);

appendChild()

operation

Node appendChild(Node node);

int32_t niso_node_append_child(niso_dom* dom, niso_handle self, niso_handle node, niso_handle* out);

replaceChild()

operation

Node replaceChild(Node node, Node child);

int32_t niso_node_replace_child(niso_dom* dom, niso_handle self, niso_handle node, niso_handle child, niso_handle* out);

removeChild()

operation

Node removeChild(Node child);

int32_t niso_node_remove_child(niso_dom* dom, niso_handle self, niso_handle child, niso_handle* out);

Not in niso yet

Members the web has, by the BCD keys web-features 3.45.0 lists, that idl/ doesn’t declare. The list is partial: web-features lists only the keys it maps to a feature.

• selectstart event (Selection)