| /* This Source Code Form is subject to the terms of the Mozilla Public | |
| * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| * file, You can obtain one at https://mozilla.org/MPL/2.0/. */ | |
| /* | |
| * For more information on this interface please see | |
| * https://html.spec.whatwg.org/multipage/#beforeunloadevent | |
| */ | |
| [Exposed=Window] | |
| interface BeforeUnloadEvent : Event { | |
| attribute DOMString returnValue; | |
| }; |