How to set the value of the font type, or its style? Well, there ... regular, thin, bold, light, etc?

Question

Fonts

Some fonts have styles called letters. for example, the font Kozuka Gothic Pro has the letters
H, L, R, M, B instead of the value.
How to typeset fonts with such styles?

Answer 1

100 - Thin (Hairline)
200 - Extra Light (Ultra Light)
300 - Light
400 - Normal
500 - Medium
600 - Semi Bold (Demi Bold)
700 - Bold
800 - Extra Bold (Ultra Bold)
900 - Black (Heavy)
Can Tools developer open and see:

Answer 2

I'm not sure that I understood your question correctly, but the style of the font (its spelling) is determined by the tag font-weightlike this:

font-weight: thin;
font-weight: normal;
font-weight: bold;