Creates the extension-host half of a webview. HTML and options are mutable, messages are recordable/fireable, and URIs get recognizable mock text. No browser executes the HTML and no CSP or origin boundary is enforced.
Test hook: simulates the webview content posting message back to the extension host.
message
Creates the extension-host half of a webview. HTML and options are mutable, messages are recordable/fireable, and URIs get recognizable mock text. No browser executes the HTML and no CSP or origin boundary is enforced.