\input regression-test.tex
\documentclass{article}
\usepackage{amsthm}
\usepackage{osgstyler}

\newtheorem{theorem}{Theorem}
\newtheorem{lemma}{Lemma}

\DeclareOsgColorPalette{bind-amsthm-test}{
  primary = {model=HTML, value=223344},
  text = {model=HTML, value=111111},
  background = {model=HTML, value=FFFFFF},
  accent = {model=HTML, value=FFD966}
}

\DeclareOsgBlockInstance{theorem}{rule-thickness=.4pt, padding=.5em}
\BindOsgBlockEnvironment{theorem}{theorem}

\begin{document}
\UseOsgColorPalette{bind-amsthm-test}
\START
\begin{theorem}
  \TYPE{theorem-nameless=shown}
\end{theorem}
\ExplSyntaxOn
\TYPE{theorem-counter-after-first=\int_use:N\value{theorem}}
\ExplSyntaxOff
\begin{theorem}[Fermat]
  \TYPE{theorem-named=shown}
\end{theorem}
\ExplSyntaxOn
\TYPE{theorem-counter-after-second=\int_use:N\value{theorem}}
\ExplSyntaxOff
\begin{lemma}
  \TYPE{lemma-unbound=shown}
\end{lemma}
\TYPE{done}
\END
\end{document}