This example demonstrates an attempt to embed a remote web viewer inside a custom HTML element using the Shadow DOM. The page defines a `dso-viewer` custom element that fetches HTML from `https://viewer.dso.kadaster.nl/viewer` and injects the response into its shadow root. The code uses the Fetch API with a `no-cors` mode, though the response is only logged to the console rather than rendered. A large styled message appears above the element, but no actual visualization or data is displayed.