% -*- coding: utf-8 -*-
% example_fu.tex, works with modern lualatex in TeX Live 2019.
% The input encoding is UTF-8 (utf8).
\documentclass{article}
\PassOptionsToPackage{hungarian}{babel}
\usepackage[fontspec]{uni8}
\begin{document}
% Alternatively, this works in lualatex: \language99 \patterns{Å‘9y}
\hyphenation{yő-yő-yő-yő-yő-yő-yő}
\showhyphens{yőyőyőyőyőyőyő}
\showhyphens{árvíztűrő tükörfúrógép}
\hrule width \hsize
\bigskip
\vbox{\Huge\hsize7em\hrule\noindent . . . . . bababababababa\hrule}
\bigskip
\vbox{\Huge\hsize7em\hrule\noindent . . . . . bábábábábábábá\hrule}
\bigskip
\vbox{\Huge\hsize7em\hrule\noindent . . . . . bőbőbőbőbőbőbő\hrule}
\bigskip
\vbox{\Huge\hsize7em\hrule\noindent . . . . . yőyőyőyőyőyőyő\hrule}
\bigskip
\vbox{\Huge\hsize9em\hrule\noindent$\sin^2\alpha+\cos^2\alpha=1$\hrule}
\bigskip
\vbox{\Huge\hsize7em\hrule\noindent Hel\texttt{lo}, \textsf{Wörld!}\hrule}
\bigskip
\vfill\hrule width\hsize
\end{document}