web - do not enable confirmBeforeQuit per default if running in kiosk mode

src/vs/workbench/browser/workbench.contribution.ts

@@ -8,6 +8,7 @@ import * as nls from 'vs/nls';
 import { IConfigurationRegistry, Extensions as ConfigurationExtensions, ConfigurationScope } from 'vs/platform/configuration/common/configurationRegistry';
 import { isMacintosh, isWindows, isLinux, isWeb, isNative } from 'vs/base/common/platform';
 import { workbenchConfigurationNodeBase } from 'vs/workbench/common/configuration';
+import { isStandalone } from 'vs/base/browser/browser';
 
 // Configuration
 (function registerConfiguration(): void {
@@ -404,7 +405,7 @@ import { workbenchConfigurationNodeBase } from 'vs/workbench/common/configuratio
 			},
 			'window.confirmBeforeQuit': {
 				'type': 'boolean',
-				'default': isWeb,
+				'default': isWeb && !isStandalone, // on by default in web, unless PWA
 				'description': nls.localize('confirmBeforeQuitWeb', "Controls whether to ask for confirmation before closing the browser tab or window."),
 				'scope': ConfigurationScope.APPLICATION,
 				'included': isWeb