Type: String (URL)
Default value: ""
This property specifies the location of the Textbox.io Spelling service. This property must be used to provide the location of a Textbox.io Spelling service to use Textbox.io's built in spell checking functionality. If this property is not specified Textbox.io will fall back to the browser's built in spell checker where it's available.
Please see Server-Side Components for information on deploying the Spelling service.
When configuring "allowed origins" for the Spelling service, it is recommended to set the ASP.NET development server to use a fixed port, e.g. 50001. Then http://localhost:50001 can be added as an "Allowed Origin" in the CORS settings.