Re: [whatwg/fullscreen] Add keyboard locking option (PR #232)

@foolip commented on this pull request.



> +like ESC or function keys are integral to the application's functionality.
+
+<p>A <a>keyboard lock</a> enables web applications to capture and handle key inputs directly,
+bypassing the default behavior typically executed by the user agent or operating system. Key events
+that would normally trigger user agent or system-level actions are instead redirected to the web
+application in fullscreen. Such key events (for individual keys or keyboard shortcuts) may either
+have no action while <a>keyboard lock</a> is active, or it could still have the same action but
+allow the web page to call {{Event/preventDefault()}} to cancel the action.
+
+<p>Whenever a <a>document</a>'s <a>keyboard lock</a> is changed from active to inactive, user agents
+must deactivate the keyboard lock and restore the handling of keyboard inputs to the default
+behavior of the user agent and the operating system.
+
+<p>User agents should reserve an additional input for the purposes of exiting fullscreen. There are
+also some system-level key sequences or combinations that cannot be intercepted for security
+reasons, such as Ctrl+Alt+Del on Windows.

I've added that with some light edits like browser &rarr; user agent.

@marcoscaceres are you happy with this addition?

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