diff --git a/src/vs/workbench/api/electron-browser/mainThreadWebview.ts b/src/vs/workbench/api/electron-browser/mainThreadWebview.ts
index ae51d1a4655..f6a2c26d62f 100644
--- a/src/vs/workbench/api/electron-browser/mainThreadWebview.ts
+++ b/src/vs/workbench/api/electron-browser/mainThreadWebview.ts
@@ -209,7 +209,7 @@ class WebviewEditor extends BaseWebviewEditor {
 			allowScripts: input.options.enableScripts,
 			enableWrappedPostMessage: true
 		};
-		this.webview.contents = [input.html];
+		this.webview.contents = input.html;
 		this.webview.style(this.themeService.getTheme());
 	}
 
diff --git a/src/vs/workbench/parts/extensions/browser/extensionEditor.ts b/src/vs/workbench/parts/extensions/browser/extensionEditor.ts
index a0566ec09fc..f1d09a11784 100644
--- a/src/vs/workbench/parts/extensions/browser/extensionEditor.ts
+++ b/src/vs/workbench/parts/extensions/browser/extensionEditor.ts
@@ -426,7 +426,7 @@ export class ExtensionEditor extends BaseEditor {
 				this.contentDisposables.push(toDisposable(removeLayoutParticipant));
 
 				this.activeWebview.style(this.themeService.getTheme());
-				this.activeWebview.contents = [body];
+				this.activeWebview.contents = body;
 
 				this.activeWebview.onDidClickLink(link => {
 					// Whitelist supported schemes for links
diff --git a/src/vs/workbench/parts/html/browser/htmlPreviewPart.ts b/src/vs/workbench/parts/html/browser/htmlPreviewPart.ts
index 06925da8b84..24cab9977cf 100644
--- a/src/vs/workbench/parts/html/browser/htmlPreviewPart.ts
+++ b/src/vs/workbench/parts/html/browser/htmlPreviewPart.ts
@@ -143,8 +143,8 @@ export class HtmlPreviewPart extends WebviewEditor {
 			this._themeChangeSubscription = this.themeService.onThemeChange(this.onThemeChange.bind(this));
 
 			if (this._hasValidModel()) {
-				this._modelChangeSubscription = this.model.onDidChangeContent(() => this.webview.contents = this.model.getLinesContent());
-				this.webview.contents = this.model.getLinesContent();
+				this._modelChangeSubscription = this.model.onDidChangeContent(() => this.webview.contents = this.model.getLinesContent().join('\n'));
+				this.webview.contents = this.model.getLinesContent().join('\n');
 			}
 		}
 	}
@@ -234,14 +234,14 @@ export class HtmlPreviewPart extends WebviewEditor {
 				this._modelChangeSubscription = this.model.onDidChangeContent(() => {
 					if (this.model) {
 						this.scrollYPercentage = 0;
-						this.webview.contents = this.model.getLinesContent();
+						this.webview.contents = this.model.getLinesContent().join('\n');
 					}
 				});
 				const state = this.loadViewState(resourceUri);
 				this.scrollYPercentage = state ? state.scrollYPercentage : 0;
 				this.webview.baseUrl = resourceUri.toString(true);
 				this.webview.options = input.options;
-				this.webview.contents = this.model.getLinesContent();
+				this.webview.contents = this.model.getLinesContent().join('\n');
 				this.webview.initialScrollProgress = this.scrollYPercentage;
 				return undefined;
 			});
diff --git a/src/vs/workbench/parts/html/browser/webview-pre.js b/src/vs/workbench/parts/html/browser/webview-pre.js
index ed6c1fc5da8..3f83e84fdb7 100644
--- a/src/vs/workbench/parts/html/browser/webview-pre.js
+++ b/src/vs/workbench/parts/html/browser/webview-pre.js
@@ -128,7 +128,7 @@
 			const options = data.options;
 			enableWrappedPostMessage = options && options.enableWrappedPostMessage;
 
-			const text = data.contents.join('\n');
+			const text = data.contents;
 			const newDocument = new DOMParser().parseFromString(text, 'text/html');
 
 			newDocument.querySelectorAll('a').forEach(a => {
diff --git a/src/vs/workbench/parts/html/browser/webview.ts b/src/vs/workbench/parts/html/browser/webview.ts
index 8c4771cbfaf..ccdf4298b60 100644
--- a/src/vs/workbench/parts/html/browser/webview.ts
+++ b/src/vs/workbench/parts/html/browser/webview.ts
@@ -284,7 +284,7 @@ export default class Webview {
 		this._options = value;
 	}
 
-	set contents(value: string[]) {
+	set contents(value: string) {
 		this._send('content', {
 			contents: value,
 			options: this._options
diff --git a/src/vs/workbench/parts/html/browser/webviewEditor.ts b/src/vs/workbench/parts/html/browser/webviewEditor.ts
index f1c7a42e68e..f5c289d3928 100644
--- a/src/vs/workbench/parts/html/browser/webviewEditor.ts
+++ b/src/vs/workbench/parts/html/browser/webviewEditor.ts
@@ -24,10 +24,6 @@ import { SyncActionDescriptor } from 'vs/platform/actions/common/actions';
 import { Action } from 'vs/base/common/actions';
 import { TPromise } from 'vs/base/common/winjs.base';
 
-export interface HtmlPreviewEditorViewState {
-	scrollYPercentage: number;
-}
-
 /**  A context key that is set when a webview editor has focus. */
 export const KEYBINDING_CONTEXT_WEBVIEWEDITOR_FOCUS = new RawContextKey<boolean>('webviewEditorFocus', false);
 /**  A context key that is set when the find widget find input in webview editor webview is focused. */
diff --git a/src/vs/workbench/parts/update/electron-browser/releaseNotesEditor.ts b/src/vs/workbench/parts/update/electron-browser/releaseNotesEditor.ts
index ace4d2f79fd..557d912273f 100644
--- a/src/vs/workbench/parts/update/electron-browser/releaseNotesEditor.ts
+++ b/src/vs/workbench/parts/update/electron-browser/releaseNotesEditor.ts
@@ -124,7 +124,7 @@ export class ReleaseNotesEditor extends WebviewEditor {
 			}
 		}
 		this.onThemeChange(this.themeService.getTheme());
-		this._webview.contents = [body];
+		this._webview.contents = body;
 
 		this._webview.onDidClickLink(link => {
 			addGAParameters(this.telemetryService, this.environmentService, link, 'ReleaseNotes')