DocumentType

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

DocumentType is an interface in idl/dom.webidl, inheriting Node, exposed in Window. It includes ChildNode. 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	8

Members

name

attribute

readonly attribute DOMString name;

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

publicId

attribute

readonly attribute DOMString publicId;

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

systemId

attribute

readonly attribute DOMString systemId;

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

before()

operation from ChildNode

undefined before((Node or DOMString)... nodes);

int32_t niso_child_node_before(niso_dom* dom, niso_handle self, const niso_node_or_string* nodes, size_t nodes_len);

after()

operation from ChildNode

undefined after((Node or DOMString)... nodes);

int32_t niso_child_node_after(niso_dom* dom, niso_handle self, const niso_node_or_string* nodes, size_t nodes_len);

replaceWith()

operation from ChildNode

undefined replaceWith((Node or DOMString)... nodes);

int32_t niso_child_node_replace_with(niso_dom* dom, niso_handle self, const niso_node_or_string* nodes, size_t nodes_len);

remove()

operation from ChildNode

undefined remove();

int32_t niso_child_node_remove(niso_dom* dom, niso_handle self);