Optional
$destroyReadonly
lengthOptional
options: boolean | AddEventListenerOptionsOptional
options: boolean | AddEventListenerOptionsDispatches a synthetic event event to target and returns true if either event's cancelable attribute value is false or its preventDefault() method was not invoked, and false otherwise.
Optional
options: boolean | EventListenerOptionsOptional
options: boolean | EventListenerOptions
A simple container list for multiple SourceBuffer objects.
MDN Reference