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:
Le systema de gradation del ration de contrasto pro le texto ha le gradationes sequente: Falle, AA*, AAA* AAA ab le minor al major legibilitate.\nItIllo era calculate in base al color de fundo calculate: