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Optimizely Forms is only supported by MVC-based websites and HTML5-compliant browsers.

You can load additional resources after form rendering with `IViewModeExternalResources`. Implement the `IViewModeExternalResources` interface to return a list of resources (JavaScript or CSS files) that are loaded into `ViewMode` along with _EPiServerForms.js._

The interface is used mostly for the following:

  • Third-party validators.

  • Rich element types (with rich, complex user interface that needs JavaScript to render UI and handle interaction), such as `DateTimeElement` in the `Forms.Samples` project.