Gets the size of the symbol character for a bulleted list. Takes a callback function with one parameter as a parameter. The callback function is called with the value as parameter upon receiving the information from the server.
A function with one parameter is called with the size of the symbol character for a bulleted list.
The property's default value is 0. The property returns its default value when the text selection contains multiple paragraphs with mixed bullet sizes or when the text selection does not contain a bulleted list.