DOMStringList

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

DOMStringList is an interface in idl/html.webidl, exposed in Window, Worker. 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	4

Members

length

attribute

readonly attribute unsigned long length;

int32_t niso_dom_string_list_get_length(niso_dom* dom, niso_handle self, uint32_t* out);

item()

operation

getter DOMString? item(unsigned long index);

int32_t niso_dom_string_list_item(niso_dom* dom, niso_handle self, uint32_t index, niso_str* out);

contains()

operation

boolean contains(DOMString string);

int32_t niso_dom_string_list_contains(niso_dom* dom, niso_handle self, const char* string, size_t string_len, bool* out);