ltx-talk - A LaTeX class for accessible presentations

Examples of using the `ltx-talk` class

Introduction

The examples on this page demonstrate various features of the ltx-talk class. The example may be used as-is or may be edited using the built in editor.

The Generate Tagged PDF button will run LaTeX (lualatex-dev) on the file and return a list of links:

The resulting PDF;
A validation report using veraPDF;
A form showing the structure tree and Validation using show-pdf-tags;
The log of the LuaLaTeX run;
A link to ngPDF which shows the structure tree, the PDF and a derived HTML version of the document.

Lists

Lists are perhaps the most common structure in presentation frames.

Revealing one item at a time

A very common pattern: reveal the list one item at a time.

\DocumentMetadata{tagging = on, pdfstandard = ua-2}

\documentclass{ltx-talk}

\title{List overlays}

\begin{document}

\begin{frame}
  \begin{itemize}[<+->]
    \item First
    \item Second
    \item Third
  \end{itemize}
\end{frame}

\end{document}

Revealing two items at once

We can use the relative specification . to reveal two items at once.

\DocumentMetadata{tagging = on, pdfstandard = ua-2}

\documentclass{ltx-talk}

\title{Relative overlays}

\begin{document}

\begin{frame}
  \begin{itemize}[<+->]
    \item First
    \item Second
    \item Third
    \item<.-> Fourth
  \end{itemize}
\end{frame}

\end{document}

Applying actions

Actions can adjust how content appears: here we highlight as we go.

\DocumentMetadata{tagging = on, pdfstandard = ua-2}

\documentclass{ltx-talk}

\title{List actions}

\begin{document}

\begin{frame}
  \begin{itemize}[<alert@+>]
    \item First
    \item Second
    \item Third
  \end{itemize}
\end{frame}

\end{document}

Presentation design

Customizing header colors

Choosing a color scheme for the header and footer is one common way to make a presentation more visually appealing.

\DocumentMetadata{tagging = on, pdfstandard = ua-2}

\documentclass{ltx-talk}

\title{Footer colors}

\EditInstance{header}{std}{
  background-color = blue!50,
  color            = white,
}

\EditInstance{footer}{std}{
  background-color = blue!50
}

\begin{document}

\begin{frame}
  \frametitle{Frametitle}
  content
\end{frame}

\end{document}

Inserting background images

Background images are another common customization.

\DocumentMetadata{tagging = on, pdfstandard = ua-2}

\documentclass{ltx-talk}

\title{Background images}

\begin{document}

\begin{frame}
  Some text
\end{frame}

\AddToHook{shipout/background}
  {\put(0cm, -\paperheight)
      {\includegraphics[artifact, width = \paperwidth, height = \paperheight]
          {example-image-a}}}

\begin{frame}
  Some text
\end{frame}

\end{document}

Ordering frame header and footer items

Currently, control of the content in headers and footers is quite simple: you can choose the entries and their ordering.

\DocumentMetadata{tagging = on, pdfstandard = ua-2}

\documentclass{ltx-talk}

\EditInstance{footer}{std}{
  color         = black!50,
  separator     = \hfill|\hfill,
  element-order = {date, author, title, institute, framenumber},
  right-hspace  = 3mm,
  left-hspace   = 3mm,
}

\author{Author Name}
\title[short-title = {Presentation title}]
  {A Long Presentation Title Which Would Not Fit in a Footer!}
\institute{Interesting Conference}

\begin{document}

\begin{frame}
  \maketitle[framestyle = wallpaper]
\end{frame}

\begin{frame}
  content
\end{frame}

\end{document}

Titlepage styling

There is more control available in terms of the title page.

\DocumentMetadata{tagging = on, pdfstandard = ua-2}

\documentclass{ltx-talk}

\EditInstance{footer}{std}{
  background-color = black!50,
  color            = black!25,
  separator        = \hfill|\hfill,
  element-order    = {date, author, title, institute, framenumber},
  right-hspace       = 3mm,
  left-hspace        = 3mm,
}

\author{Author Name}
\title{Presentation Title}
\institute{Interesting Conference}

\begin{document}

\begin{frame}
  \maketitle[framestyle = wallpaper, horizontal-alignment = left]
\end{frame}

\begin{frame}
  content
\end{frame}

\end{document}

‘Float’ alignment

‘Floats’ do not really float in presentations, but they can still be useful as part of the overall structure.

\DocumentMetadata{tagging = on, pdfstandard = ua-2}

\documentclass{ltx-talk}

\title{Float alignment}

\EditInstance{floatenv}{std}{horizontal-alignment = center}

\begin{document}

\begin{frame}
  Some content
  \begin{figure}
    `Float' content.
  \end{figure}
  More content.
\end{frame}

\end{document}

Math mode

Math font setup

Math mode works in the standard LaTeX way: here we make some changes to the font.

\DocumentMetadata{tagging = on, pdfstandard = ua-2}

\documentclass{ltx-talk}

\IfFontExistsTF{Pennstander-Regular.otf}{
  \setmainfont{Pennstander-Regular.otf}
  \setmathfont{PennstanderMath-Regular.otf}
}
{}

\title{The Quadratic Formula}
\subtitle{$ax^{2} + bx + c = 0$}
\author{David}
\institute{The \LaTeX{} Project}
\date{2025-12-06}

\begin{document}

\maketitle


\begin{frame}
  \frametitle{Completing the Square}

  \large

  First, complete the square
  
  \begin{itemize}[action-spec = <+->, item-vspace = 20pt, begin-vspace = 20pt]
    \item $ax^{2} + bx +c=0$
    \item $x^{2} + \frac{b}{a}x + \frac{c}{a} = 0$
    \item $x^{2} + \frac{b}{a}x + \bigl(\frac{b}{2a}\bigr)^{2} 
      = -\frac{c}{a} + \bigl(\frac{b}{2a}\bigr)^{2}$
    \item $\bigl(x + \frac{b}{2a}\bigr)^{2} 
      = -\frac{c}{a} + \bigl(\frac{b}{2a}\bigr)^{2}$
  \end{itemize}
\end{frame}

\begin{frame}
 \frametitle{Solve for~$x$}
 \large

 Now, solve for~$x$
 
  \begin{itemize}[action-spec = <+->, item-vspace = 20pt, begin-vspace = 20pt]
    \item $\bigl(x + \frac{b}{2a}\bigr)^{2}
      = -\frac{c}{a} + \bigl(\frac{b}{2a}\bigr)^{2}$
    \item $x + \bigl(\frac{b}{2a}\bigr)
      = \pm \sqrt{-\frac{c}{a} + \bigl(\frac{b}{2a}\bigr)^{2}}$
    \item $x = -\bigl(\frac{b}{2a}\bigr)
      \pm \sqrt{-\frac{c}{a} + \bigl(\frac{b}{2a}\bigr)^{2}}$
    \item $\displaystyle x = \frac{-b \pm \sqrt{b^{2} - 4ac}}{2a}$
  \end{itemize}
    
\end{frame}

\begin{frame}
 \frametitle{The Quadratic Formula}
 \large

 The solution of the quadratic equation.

 \[
   ax^{2} + bx + c = 0
 \]

 where~$a$ is non-zero, is given by the formula

  \[
    x = \frac{-b \pm \sqrt{b^{2} - 4ac}}{2a}
  \]

\end{frame}

\end{document}

Controlling overlays

Overlay opacity example

Overlays use opacity (transparency) to make material invisible: by adjusting the amount, part-visible content is possible.

\DocumentMetadata{tagging = on, pdfstandard = ua-2}

\documentclass{ltx-talk}

\title{Setting opacity}

\EditInstance{hidden}{std}{opacity = 0.15}

\begin{document}

\begin{frame}
  \begin{itemize}[<+->]
    \item First
    \item Second
    \item Third
  \end{itemize}
\end{frame}

\end{document}

Verbatim material

Verbatim content

The standard approach to verbatim content uses the frame* environment.

\DocumentMetadata{tagging = on, pdfstandard = ua-2}

\documentclass{ltx-talk}

\title{Verbatim}

\usepackage{fancyvrb}

\begin{document}

\begin{frame*}
  Text
  \begin{actionenv}<+-|alert@+>
    \begin{Verbatim}[gobble = 6]
      Some content
      %#$_\
      XXX
    \end{Verbatim}
  \end{actionenv}
  \uncover<+->{More text}
\end{frame*}

\end{document}

Demonstrating the class itself

To show the frame* environment itself, a second name is safest: this is shown here using standard LaTeX commands.

\DocumentMetadata{tagging = on, pdfstandard = ua-2}

\documentclass{ltx-talk}

\title{Fame in verbatim}

\NewEnvironmentCopy{Frame}{frame*}
\usepackage{fancyvrb}

\begin{document}
\begin{Frame}
  \frametitle{Demonstrating the class}
  \begin{Verbatim}[gobble = 4]
    \begin{frame*}
      Some content here
    \end{frame*}
  \end{Verbatim}
\end{Frame}
\end{document}

Presentation structure

Tracking total frames

Various counters are available: the overall length of the presentation is common requirement.

\DocumentMetadata{tagging=on, pdfstandard = ua-2}

\documentclass{ltx-talk}

\title{Frame counters}

\begin{document}

\begin{frame}
  abc
  \pause
  test
\end{frame}

\begin{frame}
  Total frame number: \RefProperty{lastpage}{totalframes}
\end{frame}

\begin{frame}
  abc
\end{frame}

\end{document}

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