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{#fig:id1 placement='H'}
\cref{fig:id1} mkdown_ref
{#fig:id2 width=50%}
link_to_header
inline: $a = b$
{#eq:id1} $$c &= d \\ other &= e$$ {#eq:id2 env=align .unnumbered}
Table: Caption. {#tbl:id}
\cref{tbl:id}
?@cell-with-link-to-header, and multiple references +[@tbl:id; @eq:id1]