The JavaScript file consists of a set of document.write() methods that write the <object> and <embed> tags that embed your application. In this example, these tags are identical to the <object> and <embed> tags used in the HTML page's <noscript> block. In more complex configurations, you can add Express Install or deep linking support to the JavaScript file that is not supported in the HTML page's <noscript> block. Remember that the code in the HTML page is for browsers that do not support JavaScript.

The <object> tag's codebase and the <embed> tag's pluginspage properties add support for basic player version detection and installation. The codebase tag defines the minimum version required at the end of the URL (for example, #version=9,0,0,0). If a client requests this page with a player version older than the version specified, they are prompted to upgrade their player.

The upgrade experience is considerably better with Express Install. If the user's player does not meet the minimum requirements, the new player is automatically installed for them. You add Express Install by editing your wrapper. For more information, see Using Express Install.

With a generic wrapper, a user who clicks the Back and Forward buttons in their browser navigates the HTML pages in the browser's history and not the history of their interactions within the Flex application. Deep linking lets users navigate their interactions with the Flex application by using the Back and Forward buttons in their browser. You can add deep linking by editing your wrapper. For more information, see Deep Linking.

In addition to adding deep linking and Adobe® Flash® Player detection support to your wrapper, you can use other properties of the <object> and <embed> tags to add functionality. For more information, see About the object and embed tags.