1

I am trying uncover contents of a slide but I do not get any alerted text styling when using \uncover<+- | alert@+>. The content are just uncovered.

MWE

\documentclass[aspectratio=169, xcolor={x11names}]{beamer}

\usecolortheme{rose}
\useoutertheme[]{split}
\useinnertheme{inmargin}
\setbeamersize{sidebar width left=5cm, sidebar width right=0cm}
\setbeamersize{text margin left=3mm, text margin right=3mm}
\setbeamersize{description width=0mm}
\setbeamercovered{transparent=30}



\begin{document}

\begin{frame}{Uncovering Contents with Alert}

    \begin{block}{Why is induction motor very common}
        %
        \uncover<+->{\phantom{$1$}}\uncover<+->{Induction motors are very practical for the following reasons}

        \begin{description}[<+- | alert@+>]
            \item[Rigid] Rigid
            \item[Cheap] Cheap
            \item[Low Maintenance] Low Maintenance
            \item[Self-Starting] Self-starting
            \item[No Excitation Needed] No Excitation Needed
        \end{description}

        \uncover<+- | alert@+>{Extra content}

    \end{block}

\end{frame}

\end{document}
1

Easy workaround:

\documentclass[aspectratio=169, xcolor={x11names}]{beamer}

\usecolortheme{rose}
\useoutertheme[]{split}
\useinnertheme{inmargin}
\setbeamersize{sidebar width left=5cm, sidebar width right=0cm}
\setbeamersize{text margin left=3mm, text margin right=3mm}
\setbeamersize{description width=0mm}
\setbeamercovered{transparent=30}



\begin{document}

\begin{frame}{Uncovering Contents with Alert}

    \begin{block}{Why is induction motor very common}
        %
        \uncover<+->{\phantom{$1$}}\uncover<+->{Induction motors are very practical for the following reasons}

        \begin{description}[<+- | alert@+>]
            \item[Rigid] Rigid
            \item[Cheap] Cheap
            \item[Low Maintenance] Low Maintenance
            \item[Self-Starting] Self-starting
            \item[No Excitation Needed] No Excitation Needed
        \end{description}

        \uncover<+->{\alert<.>{Extra content}}

    \end{block}

\end{frame}

\end{document}

enter image description here

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