The WebExtensionTaskPane type exposes the following members.
Gets and sets the last-docked location of this taskpane object.
Indicates whether the taskpane is locked to the document in the UI and cannot be closed by the user.
Indicates whether the Task Pane shows as visible by default when the document opens.
Gets and sets the index, enumerating from the outside to the inside, of this taskpane among other persisted taskpanes docked in the same default location.
Gets and sets the web extension part associated with the taskpane instance
Gets and sets the default width value for this taskpane instance.