The HTML content embedded in Purple DS must be able to run on the target devices. You can easily verify this by testing Purple DS content. Another option is running the HTML content on a web server and loading the content on the mobile devices' system browser. So if they are working on the system browser, they'll want to work in a Purple DS app.
More about Test of html content for usage in Purple DS Apps on a MAC .
You can find our video tutorial on HTML integration on YouTube: