loadAlternateHtml
Load the given @content string for the URI @content_uri.
This allows clients to display page-loading errors in the #WebKitWebView itself. When this method is called from #WebKitWebView::load-failed signal to show an error page, then the back-forward list is maintained appropriately. For everything else this method works the same way as webkit_web_view_load_html().
Parameters
content
the new content to display as the main page of the @web_view
contentUri
the URI for the alternate page content
baseUri
the base URI for relative locations or null