Web API and Web Engine

Supported web API

HTML, CSS, and JavaScript are the core web technologies to build web pages or web apps. HTML presents the structure of the pages or the application using markup and CSS formats the contents written in HTML such as colors, layouts, font, etc. JavaScript is a programming language for the web which has been standardized in the ECMAScript. Using HTML5, CSS3, and JavaScript, you can develop web apps for webOS TV.

webOS TV 1.0, 2.0, and 3.0

We provide specification charts that list methods, attributes, and events of HTML5, properties of CSS3, and features of JavaScript (ECMAScript features) which are currently supported by webOS TV and the webOS TV emulator. Note that two different engines are used for the internal web browser and web apps on webOS TV 1.0 and 2.0. Thus, we recommend that you check whether those APIs run as you expected on webOS TV or the emulator.
Download the Supported Standard Web APIs file.

webOS TV 4.0 and above

From webOS TV 4.0, we do not provide the charts any longer. Instead, we let you know web engines and its versions used on webOS TV.

Web engine

The web engine of the webOS TV platform provides an app programming environment for content providers and aggregators. The following table shows the web engine and its version for each webOS TV platform:

You can check the webOS TV version on the TV menu or by using Luna API as follows:

• Settings menu: Settings > General > TV Information > webOS TV version
• Luna API: sdkVersion parameter in the getSystemInfo() method

Cookie and cache support of LG web browser engine

The LG web browser engine supports cookies and saves cache for enhanced performance. The stored cache is used only while the web browser engine is running and is not used anymore once an app has been terminated. Note that only hosted web apps (HTTP/HTTPS scheme) can use cookies; the webOS TV platform does not support cookies on packaged web apps (file scheme).

userAgent string

A web app can get the string from the HTML DOM property,navigator.userAgent. The same string is included in the HTTP request User-Agent header. The userAgent string that corresponds to the LG browser engine of each webOS TV platform is as follows:

• webOS TV 24

  Mozilla/5.0 (Web0S; Linux/SmartTV) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.5359.211 Safari/537.36 WebAppManager

• webOS TV 23

  Mozilla/5.0 (Web0S; Linux/SmartTV) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.128 Safari/537.36 WebAppManager

• webOS TV 22

  Mozilla/5.0 (Web0S; Linux/SmartTV) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36 WebAppManager

• webOS TV 6.x

  Mozilla/5.0 (Web0S; Linux/SmartTV) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.79 Safari/537.36 WebAppManager

• webOS TV 5.x

  Mozilla/5.0 (Web0S; Linux/SmartTV) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36 WebAppManager

• webOS TV 4.x

  Mozilla/5.0 (Web0S; Linux/SmartTV) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.34 Safari/537.36 WebAppManager

• webOS TV 3.x

  Mozilla/5.0 (Web0S; Linux/SmartTV) AppleWebKit/537.36 (KHTML, like Gecko) QtWebEngine/5.2.1 Chrome/38.0.2125.122 Safari/537.36 WebAppManager

• webOS TV 2.x

  Mozilla/5.0 (Web0S; Linux/SmartTV) AppleWebKit/538.2 (KHTML, like Gecko) Large Screen WebAppManager Safari/538.2

• webOS TV 1.x

  Mozilla/5.0 (Web0S; Linux/SmartTV) AppleWebKit/537.41 (KHTML, like Gecko) Large Screen WebAppManager Safari/537.41