The activity indicator provides a simple widget showing background activity (Ajax calls and pending map tile requests). In the default configuration it uses a spinner GIF to work. This can be easily modified by overriding the CSS for the widget.
activityClass: mb-activity # CSS class to indicate activity (Ajax or tile)
ajaxActivityClass: mb-activity-ajax # CSS class to indicate Ajax activity
tileActivityClass: mb-activity-tile # CSS class to indicate tile loading activity
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