document.fire(eventName[, memo[, bubble = true]]) → Event

• memo (?) – Metadata for the event. Will be accessible through the event's memo property.
• bubble (Boolean) – Whether the event will bubble.

Fires a custom event of name eventName with document as the target.

document.fire is the document-wide version of Element.fire.

Custom events must include a colon (:) in their names.