AbortController

AbortController and AbortSignal aborting

Baseline: Widely available on the web, in every major browser since Mar 2019, and long enough to count on (since Sep 2021).

niso: Partial 97%. 70 of 72 subtests pass, by system: Linux 97%, macOS 97%. Engines: QuickJS, the engine niso's WPT run uses; Node and Porffor have no recorded run. WPT results recorded at f3b4fa8, 2026-11-10; web-features 3.45.0. WPT tests · niso's support · AbortController, AbortSignal

AbortController is an interface in idl/dom.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
AbortController and AbortSignal	Widely available	Partial 97% 70 of 72 subtests pass	4

Members

constructor

constructor

constructor();

int32_t niso_abort_controller_new(niso_dom* dom, niso_handle* out);

signal

attribute

[SameObject] readonly attribute AbortSignal signal;

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

abort()

operation

[NisoReentrant] undefined abort(optional [NisoHeld] any reason);

int32_t niso_abort_controller_abort(niso_dom* dom, niso_handle self, niso_held reason);

NisoHeld: the reason is the caller’s value itself. Without one the standard makes a new “AbortError” DOMException, which the JS binding passes; through the C API a null reason stays null.