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// Copyright 2018 The Cobalt Authors. 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);
};