\begin{table}
\centering
\begin{talltblr}[         %% tabularray outer open
caption={HTML render 1st row. LaTeX render 2nd row.},
]                     %% tabularray outer close
{                     %% tabularray inner open
colspec={Q[]},
hline{2}={1}{solid, black, 0.05em},
hline{1}={1}{solid, black, 0.1em},
hline{4}={1}{solid, black, 0.1em},
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a \\
*Hello* \\
\textbf{World} \\
\end{talltblr}
\end{table} 
