diff --git a/src/vs/workbench/parts/html/browser/html.contribution.ts b/src/vs/workbench/parts/html/browser/html.contribution.ts
index 8201c1cfe1d..cebedb5d247 100644
--- a/src/vs/workbench/parts/html/browser/html.contribution.ts
+++ b/src/vs/workbench/parts/html/browser/html.contribution.ts
@@ -17,7 +17,6 @@ import { Registry } from 'vs/platform/registry/common/platform';
 import { SyncDescriptor } from 'vs/platform/instantiation/common/descriptors';
 import { IEditorGroupService } from 'vs/workbench/services/group/common/groupService';
 import { MenuRegistry } from 'vs/platform/actions/common/actions';
-import { WebviewElement } from 'vs/workbench/parts/html/browser/webview';
 import { IExtensionsWorkbenchService } from 'vs/workbench/parts/extensions/common/extensions';
 import { IEditorRegistry, EditorDescriptor, Extensions as EditorExtensions } from 'vs/workbench/browser/editor';
 
@@ -118,7 +117,7 @@ CommandsRegistry.registerCommand('_webview.openDevTools', function () {
 	const elements = document.querySelectorAll('webview.ready');
 	for (let i = 0; i < elements.length; i++) {
 		try {
-			(elements.item(i) as WebviewElement).openDevTools();
+			(elements.item(i) as Electron.WebviewTag).openDevTools();
 		} catch (e) {
 			console.error(e);
 		}
diff --git a/src/vs/workbench/parts/html/browser/webview.ts b/src/vs/workbench/parts/html/browser/webview.ts
index da5b27f0b22..9b0aa8f243e 100644
--- a/src/vs/workbench/parts/html/browser/webview.ts
+++ b/src/vs/workbench/parts/html/browser/webview.ts
@@ -16,22 +16,6 @@ import { WebviewFindWidget } from './webviewFindWidget';
 import { IContextViewService } from 'vs/platform/contextview/browser/contextView';
 import { IContextKey } from 'vs/platform/contextkey/common/contextkey';
 
-export declare interface WebviewElement extends HTMLElement {
-	src: string;
-	preload: string;
-	send(channel: string, ...args: any[]);
-	openDevTools(): any;
-	getWebContents(): any;
-	findInPage(value: string, options?: WebviewElementFindInPageOptions);
-	stopFindInPage(action: string);
-}
-
-export class StopFindInPageActions {
-	static clearSelection = 'clearSelection';
-	static keepSelection = 'keepSelection';
-	static activateSelection = 'activateSelection';
-}
-
 export interface WebviewElementFindInPageOptions {
 	forward?: boolean;
 	findNext?: boolean;
@@ -58,7 +42,7 @@ export interface WebviewOptions {
 export default class Webview {
 	private static index: number = 0;
 
-	private _webview: WebviewElement;
+	private readonly _webview: Electron.WebviewTag;
 	private _ready: TPromise<this>;
 	private _disposables: IDisposable[] = [];
 	private _onDidClickLink = new Emitter<URI>();
@@ -70,14 +54,14 @@ export default class Webview {
 	private _findStarted: boolean = false;
 
 	constructor(
-		private parent: HTMLElement,
-		private _styleElement: Element,
-		@IContextViewService private _contextViewService: IContextViewService,
-		private _contextKey: IContextKey<boolean>,
-		private _findInputContextKey: IContextKey<boolean>,
+		private readonly parent: HTMLElement,
+		private readonly _styleElement: Element,
+		@IContextViewService private readonly _contextViewService: IContextViewService,
+		private readonly _contextKey: IContextKey<boolean>,
+		private readonly _findInputContextKey: IContextKey<boolean>,
 		private _options: WebviewOptions = {},
 	) {
-		this._webview = <any>document.createElement('webview');
+		this._webview = document.createElement('webview');
 		this._webview.setAttribute('partition', this._options.allowSvgs ? 'webview' : `webview${Webview.index++}`);
 
 		// disable auxclick events (see https://developers.google.com/web/updates/2016/10/auxclick)
@@ -119,7 +103,7 @@ export default class Webview {
 					return;
 				}
 
-				contents.session.webRequest.onBeforeRequest((details, callback) => {
+				(contents.session.webRequest as any).onBeforeRequest((details, callback) => {
 					if (details.url.indexOf('.svg') > 0) {
 						const uri = URI.parse(details.url);
 						if (uri && !uri.scheme.match(/file/i) && (uri.path as any).endsWith('.svg') && !this.isAllowedSvg(uri)) {
@@ -130,7 +114,7 @@ export default class Webview {
 					return callback({});
 				});
 
-				contents.session.webRequest.onHeadersReceived((details, callback) => {
+				(contents.session.webRequest as any).onHeadersReceived((details, callback) => {
 					const contentType: string[] = (details.responseHeaders['content-type'] || details.responseHeaders['Content-Type']) as any;
 					if (contentType && Array.isArray(contentType) && contentType.some(x => x.toLowerCase().indexOf('image/svg') >= 0)) {
 						const uri = URI.parse(details.url);
@@ -295,7 +279,6 @@ export default class Webview {
 			styles['scrollbar-thumb-hover'] = 'rgba(100, 100, 100, 0.7)';
 			styles['scrollbar-thumb-active'] = 'rgba(85, 85, 85, 0.8)';
 			activeTheme = 'vscode-dark';
-
 		} else {
 			styles['scrollbar-thumb'] = 'rgba(111, 195, 223, 0.3)';
 			styles['scrollbar-thumb-hover'] = 'rgba(111, 195, 223, 0.8)';
@@ -392,7 +375,7 @@ export default class Webview {
 
 	public stopFind(keepSelection?: boolean): void {
 		this._findStarted = false;
-		this._webview.stopFindInPage(keepSelection ? StopFindInPageActions.keepSelection : StopFindInPageActions.clearSelection);
+		this._webview.stopFindInPage(keepSelection ? 'keepSelection' : 'clearSelection');
 	}
 
 	public showFind() {