IFrameControl.setSandboxExceptions
        Set space separated list of exceptions for the sandbox mode.
 allow-forms: Allows the resource to submit forms. If this keyword is not used, form submission is blocked.
 allow-modals: Let the resource open modal windows.
 allow-orientation-lock: Lets the resource lock the screen orientation.
 allow-pointer-lock: Lets the resource use the Pointer Lock API
 allow-popups: Allow popups (e.g window.open())
 allow-popups-to-escape-sandbox:  Lets the sandboxed document open new windows without those windows inheriting the sandboxing.
 allow-presentation: Lets the resource start a presentation session.
 allow-same-origin: Allows the IFrame content to be treated as being from the same origin.
 allow-scripts: Allows running scripts.
 allow-top-navigation: Allows the IFrame content to navigate its top level browser content.