Emitted when JavaScript code calls
<function>element.webkitRequestFullScreen</function>. If the
signal is not handled the #WebKitWebView will proceed to full screen
its top level window. This signal can be used by client code to
request permission to the user prior doing the full screen
transition and eventually prepare the top-level window
(e.g. hide some widgets that would otherwise be part of the
full screen window).
Emitted when JavaScript code calls <function>element.webkitRequestFullScreen</function>. If the signal is not handled the #WebKitWebView will proceed to full screen its top level window. This signal can be used by client code to request permission to the user prior doing the full screen transition and eventually prepare the top-level window (e.g. hide some widgets that would otherwise be part of the full screen window).