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:
文字对比度评级系统具有下列评级：失败、AA*、AAA*、AAA。AAA 最有最高的可读性。\n它的计算依据其背景颜色：