pandoc/test/command/4690.md

% pandoc -t beamer
# title

:::: {.columns}
::: {.column width="8%"}
content
:::
::: {.column width="84%"}
content2
:::
::::
^D
\begin{frame}{title}
\protect\hypertarget{title}{}

\begin{columns}[T]
\begin{column}{0.08\textwidth}
content
\end{column}

\begin{column}{0.84\textwidth}
content2
\end{column}
\end{columns}

\end{frame}