This package only supports iOS. To support other platforms, you can install additional 3D WebView packages (Windows and macOS, Android, UWP, WebGL, or create a custom bundle). All of the 3D WebView packages work seamlessly together, so all you need to do is install them into the same project, and then 3D WebView automatically detects and uses the correct plugin at runtime and build time.
3D WebView's native iOS plugins are provided as precompiled libraries, and the native source code for them is not provided.
3D WebView's native iOS plugins can't run in the editor, so a mock webview implementation is used by default while running in the editor. However, you can actually load and render real web content in the editor by also installing 3D WebView for Windows and macOS into the project.
When not running in Native 2D Mode, the iOS plugin has a limitation where some 3rd-party JS video widgets do not function as expected. For more details, please see this article.
When not running in Native 2D Mode, the web rendering frame rate of the iOS plugin is relatively slow (<15 FPS) due to iOS limitations. The exception to this is video, which is rendered at a high frame rate.
When not running in Native 2D Mode, the iOS plugin doesn't support rendering WebGL content.