In angular material color palettes (such as $mat-indigo or $mat-pink), what are A100, A200, A400, and A700 used for?

Question

Here is an example of an angular-material color palette

$bv-brand: (
    50: #ffffff,
    100: #dde6f3,
    200: #b4c9e4,
    300: #7fa3d1,
    400: #6992c9,
    500: #5282c1,
    600: #4072b4,
    700: #38649d,
    800: #305687,
    900: #284770,
    A100: #ffffff,
    A200: #dde6f3,
    A400: #6992c9,
    A700: #38649d,
    contrast: (
        50: $black-87-opacity,
        100: $black-87-opacity,
        200: $black-87-opacity,
        300: $black-87-opacity,
        400: $black-87-opacity,
        500: white,
        600: white,
        700: white,
        800: white,
        900: white,
        A100: $black-87-opacity,
        A200: $black-87-opacity,
        A400: $black-87-opacity,
        A700: white,
    )
);

I know that the values 50-900 are used for different shades of angular-material components, are the A100-700 values used similarly? What are the values with the leading 'A' used for?

Answer 1

'A' 表示“强调色”——A100、A200 和 A300 色调由 Angular Material 中包含的“预建”主题用于强调色板。但这只是他们选择做的事情。对此没有“标准” - 创建自己的主题时，您可以自由使用调色板中的任何色调。唯一真正重要的是您在mat-palette()调用“默认”、“更亮”和“更暗”选项时指定的色调索引。默认情况下（即未指定时），分别使用键“500”、“100”和“700”。