The contrast ratio grading system for text has the following grading: Fail, AA*, AAA* AAA from lowest to highest readability.\nIt was calculated based on the computed background color:
Mae'r system graddio cymhareb cyferbyniad ar gyfer testun yn cynnwys y graddio canlynol. Methu, AA*, AAA* AAA o'r darllenadwy isaf i'r uchaf.\nCafodd ei gyfrifo ar sail lliw cefndir cyfrifedig: