Definition
Fenced Frame defines FenceEvent
dictionary FenceEvent {
// This dictionary has two mutually exclusive modes that aren’t represented as
// distinct IDL types due to distinguishability issues:
//
// When reporting to a preregistered destination (specified by enum), the following
// properties are used:
DOMString eventType;
DOMString eventData;
sequence<FenceReportingDestination> destination;
// Determines if this data can be sent in a reportEvent() beacon or automatic
// beacon that originates from a document that is cross-origin to the mapped
// URL of the fenced frame config that loaded this frame tree.
// Note that automatic beacon data can only be set from documents that are
// same-origin to the fenced frame config’s mapped URL, so this effectively
// opts in the data to being used in a cross-origin subframe.
boolean crossOriginExposed = false;
// When setting event data to be used later in an automatic beacon, the
// following properties are used:
boolean once = false;
// When reporting to a custom destination URL (with substitution of macros defined by
// the Protected Audience buyer), the following property is used:
USVString destinationURL;
};