function toggle(name, vars, node) {
			var fmt = get(name);

			if (match(name, vars, node) && (!('toggle' in fmt[0]) || fmt[0].toggle)) {
				remove(name, vars, node);
			} else {
				apply(name, vars, node);
			}
		}
Toggles the specified format on/off.

@method toggle
@param {String} name Name of format to apply/remove.
@param {Object} vars Optional list of variables to replace within format before applying/removing it.
@param {Node} node Optional node to apply the format to or remove from. Defaults to current selection.