I need to know how to set the "font-weight: lighter/ bolder"
font-weight: lighter/ bolder
\documentclass{article}
\usepackage{fontspec}
\begin{document}
\font\ta="Times New Roman":color=ff0000 at 10pt
\font\tenrm = cmr17 at 10pt
\font\scra="Charis SIL/m" at 12pt
\font\scrb="Charis SIL/b" at 12pt
\font\scrc="Charis SIL/bx" at 12pt
\font\scrd="Charis SIL/sb" at 12pt
\font\scre="Charis SIL/c" at 12pt
\font\scrTa="Times New Roman/m" at 12pt
\font\scrTb="Times New Roman/b" at 12pt
\font\scrTc="Times New Roman/bx" at 12pt
\font\scrTd="Times New Roman/sb" at 12pt
\font\scrTe="Times New Roman/c" at 12pt
\ta{font-weight: lighter/ bolder }
m Medium
b Bold
bx Bold extended
sb Semi-bold
c Condensed
\scra{am Medium}
\scrb{ab Bold}
\scrc{abx Bold extended}
\scrd{asb Semi-bold}
\scre{ac Condensed}
\scrTa{am Medium}
\scrTb{ab Bold}
\scrTc{abx Bold extended}
\scrTd{asb Semi-bold}
\scrTe{ac Condensed}
\afseries{ultralight}
\lfseries{light}
\sfseries{semibold}
\bfseries{bold}
\cfseries{black}
\xfseries{extra black}
\afseries ultralight
\lfseries light
\sfseries semibold
\bfseries bold
\cfseries black
\xfseries extra black
\tenrm{T1 classT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clasT1 clas }
\end{document}
Please help me.
Thanks
