| // 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); |
| }; |
