// Copyright 2018 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// This interface exists to support the special case OnErrorEventHandler:
//   https://html.spec.whatwg.org/#onerroreventhandler

callback interface OnErrorEventListener {
  // TODO: Because the EventHandler type is typedef'd as a nullable
  // EventListener, we need to allow the return of a boolean value. The value
  // of this will only be checked if the EventListener was added as an
  // attribute (not through addEventListener).
  boolean? handleEvent(
      (Event or DOMString) event, optional DOMString filename,
      optional unsigned long lineno, optional unsigned long colno,
      optional any error);
};