Yma y newidir rhwng maint wynebfath sy' n osodedig, a maint wynebfath a chyfrifir yn ddinamig ac a addasir i amgychedd sy' n newid (e. e. dimensiynau' r celfigyn, maint y papur).
Here you can switch between fixed font size and font size to be calculated dynamically and adjusted to changing environment (e.g. widget dimensions, paper size).