% The driver selects only a standard class and ordinary public packages.
% Label names are deliberately unrelated to the kind of their targets.
\begin{document}
Forward reference: \ref{alpha}.

\ifdefined\chapter
  \chapter{Main chapter}\label{main-chapter}
\fi
\section{Main section}\label{main-section}

\begin{figure}[htbp]
  \centering\rule{25mm}{5mm}
  \caption{A figure with an arbitrary label}\label{alpha}
\end{figure}

\begin{table}[htbp]
  \centering\begin{tabular}{cc}a&b\\c&d\end{tabular}
  \caption{A table whose label looks like an equation}\label{eq:not-equation}
\end{table}

\begin{equation}
  a=b\label{fig:not-figure}
\end{equation}

\begin{align}
  x&=y\label{row-one}\\
  u&=v\label{row-two}
\end{align}

\begin{subequations}\label{family}
  \begin{equation}p=q\label{family-one}\end{equation}
  \begin{equation}r=s\label{family-two}\end{equation}
\end{subequations}

% Same raw tag, but different visible forms: (S) versus S.
\begin{equation}c=d\tag{S}\label{tag-with-parentheses}\end{equation}
\begin{equation}e=f\tag*{S}\label{tag-without-parentheses}\end{equation}

\begin{theorem}\label{statement}
  A theorem.
\end{theorem}
\begin{lemma}\label{shared-counter}
  A lemma sharing the theorem counter.
  \begin{probe-wrapper}
    The same lemma, inside an unrelated environment.\label{nested-label}
  \end{probe-wrapper}
\end{lemma}

\begin{enumerate}
  \item First item.\label{outer-item}
    \begin{enumerate}
      \item Nested item.\label{inner-item}
    \end{enumerate}
\end{enumerate}
A footnote\footnote{A labelled footnote.\label{note}}.

\begin{figure}[htbp]
  \centering
  \begin{subfigure}{.35\linewidth}
    \centering\rule{20mm}{5mm}
    \caption{First panel}\label{panel-one}
  \end{subfigure}
  \begin{subfigure}{.35\linewidth}
    \centering\rule{20mm}{5mm}
    \caption{Second panel}\label{panel-two}
  \end{subfigure}
  \caption{A figure with two panels}\label{panels}
\end{figure}

% Ordinary numbered references still work inside moving arguments.
\section{Reference to Figure \ref{alpha}}\label{moving-title}

\appendix
\ifdefined\chapter
  \chapter{Supplement}\label{supplement}
\else
  \section{Supplement}\label{supplement}
\fi
\begin{equation}g=h\label{appendix-equation}\end{equation}

\section*{An unnumbered heading}\label{unnumbered}
The label above must not be mistaken for a newly numbered heading.

\clearpage
REFERENCE-CHECK-BEGIN
\par
Figure \ref{alpha}; table \ref{eq:not-equation}; equation \ref{fig:not-figure}.
\par
Theorem \ref{statement}; lemma \ref{shared-counter}; nested \ref{nested-label}.
\par
Tags \ref{tag-with-parentheses} and \ref{tag-without-parentheses}.
\par
Panels \ref{panel-one} and \ref{panel-two}; appendix \ref{supplement}.
\par
REFERENCE-CHECK-END
\end{document}