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docs(theming): theming guide is missing documentation on the accent hues (A200, A100, etc) #26845

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@seneric

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@seneric

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In your documentation when you talk about "palette" you say "These identifier numbers include 50, and then each 100 value between 100 and 900" and you give an example.
50: #e8eaf6,
100: #c5cae9,
200: #9fa8da,
300: #7986cb,
// ... continues to 900
contrast: (
50: rgba(black, 0.87),
100: rgba(black, 0.87),
200: rgba(black, 0.87),
300: white,
// ... continues to 900
)
);

But later when you talk about theme when you define the primary color OK no problem because you are using a value consistent with your declaration in the palette ($my-primary: mat.define-palette(mat.$indigo-palette, 500)).
But for the accent color there is a problem because the values ​​no longer match your palette declaration (define-palette(mat.$pink-palette, A200, A100, A400)) -> what about A200, A100, A400 ?

Moreover why you need to declare in each palette "accent" values if in you theme you declare an accent color with all the hues from 50 to 900 ?

This problem has consequences in the code if you want to manage the light and dark theme with the "new" declaration model (with color in the map).
If you declare a palette without Axxx and try to inject it in the map at the 'color'/'background'
level you obtain "color: null is not a color" error.
Moreover you can't use SASS custom properties "var(--xxxxxx)" in the palette to manage foreground and bacground !!

Affected documentation page

https://material.angular.io/guide/theming

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    P3An issue that is relevant to core functions, but does not impede progress. Important, but not urgentarea: themingdocsThis issue is related to documentation

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