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docs: WebView on WebAssembly (backport #18633) #18634

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Oct 31, 2024
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docs: WebView on WebAssembly (backport #18633) #18634

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9 changes: 8 additions & 1 deletion doc/articles/controls/WebView.md
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> Uno Platform supports two `WebView` controls - a legacy `WebView` and a modernized `WebView2` control. For new development, we strongly recommend `WebView2` as it will get further improvements in the future.

`WebView2` is currently supported on Windows, Android, iOS, macOS (Catalyst), and Skia WPF.
`WebView2` is currently supported on Windows, Android, iOS, macOS (Catalyst), Desktop (Windows), and WebAssembly.

## Basic usage

Expand All @@ -27,6 +27,13 @@ MyWebView.NavigateToString("<html><body><p>Hello world!</p></body></html>");
> [!IMPORTANT]
> For Skia WPF, you should add `<PackageReference Include="Microsoft.Web.WebView2" Aliases="WpfWebView" />` to your csproj.

## WebAssembly support

In case of WebAssembly, the control is supported via a native `<iframe>` element. This means all `<iframe>` browser security considerations and limitations also apply to `WebView`:

- The [`frame-ancestors` Content Security Policy](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/frame-ancestors) can be used to allow embedding a site you have control over, while at the same time blocking third-party sites from embedding
- External site you are embedding must not block embedding via [`X-FRAME-OPTIONS` header](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Frame-Options)

## Executing JavaScript

When a page is loaded inside the `WebView2` control, you can execute custom JavaScript code. To do this, call the `ExecuteScriptAsync` method:
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