\documentclass[12pt,a4paper,twoside]{article}
\usepackage{fontspec}
\setmainfont{Crimson}
\newfontfamily\crimsonbold{Crimson Bold}
\usepackage{polyglossia}
\setdefaultlanguage{english}
\setotherlanguage{slovak}
\usepackage{xcolor}
\usepackage[left=1in,top=1in,right=1in,bottom=1.25in,bindingoffset=0.25in]{geometry}
%
\def\kernpairsLcaron{Ľa Ľu ĽA ĽB ĽC ĽD ĽK ĽO ĽU ĽV}
\def\kernpairsdltcaron{ďk ľk ťk}
\def\slovakaccentedalpha{á ä č ď é í ĺ ľ ň ó ô ŕ š ť ú ý ž}
\def\slovakaccentedAlpha{Á Ä Č Ď É Í Ĺ Ľ Ň Ó Ô Ŕ Š Ť Ú Ý Ž}
\newcommand\testallweights[1]{\begin{tabular}{@{}l@{\enskip}l@{}}
#1 & \textit{#1}\\
\textbf{#1} & \textit{\textbf{#1}}\\
{\crimsonbold #1} & {\crimsonbold\textit{#1}}\\
\textsc{#1} & \textsc{\textit{#1}}\\
\textsc{\textbf{#1}} & \textsc{\textit{\textbf{#1}}}\\
\textsc{\crimsonbold #1} & \textsc{\crimsonbold\textit{#1}}\\
\end{tabular}}
\newcommand{\red}[1]{{\color{red} #1}}
%
\begin{document}
\section{Crimson font specimen}
\subsection{Letters and letter pairs from Slovak language}
\subsubsection{Accented characters}
\begin{slovak}
\testallweights{\slovakaccentedalpha}\\
\testallweights{\slovakaccentedAlpha}
\subsubsection{Letter pairs}
\testallweights{\kernpairsLcaron}
\testallweights{\kernpairsdltcaron}
\subsubsection{Sample words in use}
Bu\red{ľv}a BU\red{ĽV}A \red{Ľv}ov \red{ĽV}OV \red{Ľa}n \red{ĽA}N \red{Ľu}bica \red{ĽU}BICA \red{Ľu}b\red{ľa}na \red{ĽU}B\red{ĽA}NA Ma\red{ťk}o Pa\red{ľk}o A\red{ďk}a S\red{ĽU}K Ve\red{ľk}ý VE\red{ĽK}Ý K\red{ľa}k K\red{ĽA}K I\red{ľk}o I\red{ĽK}O \red{ľo}ľo \red{ĽO}ĽO ma\red{ľb}a MA\red{ĽB}A Je\red{ľc}in JE\red{ĽC}IN Ve\red{ľd}ielo VE\red{ĽD}IELO
\end{slovak}
\end{document}