chromium/src/third_party/blink/renderer/core/html/custom/custom_state_set.idl

// Copyright 2021 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// https://wicg.github.io/custom-state-pseudo-class/#customstateset
[
  Exposed=Window,
  RuntimeEnabled=CustomStatePseudoClass
]
interface CustomStateSet {
  setlike<DOMString>;
  [RaisesException] void add(DOMString key);
};