diff --git a/presentations/practice_slide_andrew_kelley.Rmd b/presentations/practice_slide_andrew_kelley.Rmd
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+++ b/presentations/practice_slide_andrew_kelley.Rmd
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+---
+title: "Practice Slide"
+subtitle: "⚔<br/>using xaringan"
+author: "Andrew Kelley"
+institute: "RStudio, PBC"
+date: "1/23/2026 (updated: `r Sys.Date()`)"
+output:
+  xaringan::moon_reader:
+    lib_dir: libs
+    nature:
+      highlightStyle: github
+      highlightLines: true
+      countIncrementalSlides: false
+
+---
+
+
diff --git a/presentations/practice_slide_andrew_kelley.html b/presentations/practice_slide_andrew_kelley.html
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+<!DOCTYPE html>
+<html lang="" xml:lang="">
+  <head>
+    <title>Practice Slide</title>
+    <meta charset="utf-8" />
+    <meta name="author" content="Andrew Kelley" />
+    <script src="libs/header-attrs-2.30/header-attrs.js"></script>
+    <link href="libs/remark-css-0.0.1/default.css" rel="stylesheet" />
+    <link href="libs/remark-css-0.0.1/default-fonts.css" rel="stylesheet" />
+  </head>
+  <body>
+    <textarea id="source">
+class: center, middle, inverse, title-slide
+
+.title[
+# Practice Slide
+]
+.subtitle[
+## ⚔<br/>using xaringan
+]
+.author[
+### Andrew Kelley
+]
+.institute[
+### RStudio, PBC
+]
+.date[
+### 1/23/2026 (updated: 2026-01-23)
+]
+
+---
+
+
+
+    </textarea>
+<style data-target="print-only">@media screen {.remark-slide-container{display:block;}.remark-slide-scaler{box-shadow:none;}}</style>
+<script src="https://remarkjs.com/downloads/remark-latest.min.js"></script>
+<script>var slideshow = remark.create({
+  "highlightStyle": "github",
+  "highlightLines": true,
+  "countIncrementalSlides": false
+});
+if (window.HTMLWidgets) slideshow.on('afterShowSlide', function (slide) {
+  window.dispatchEvent(new Event('resize'));
+});
+(function(d) {
+  var s = d.createElement("style"), r = d.querySelector(".remark-slide-scaler");
+  if (!r) return;
+  s.type = "text/css"; s.innerHTML = "@page {size: " + r.style.width + " " + r.style.height +"; }";
+  d.head.appendChild(s);
+})(document);
+
+(function(d) {
+  var el = d.getElementsByClassName("remark-slides-area");
+  if (!el) return;
+  var slide, slides = slideshow.getSlides(), els = el[0].children;
+  for (var i = 1; i < slides.length; i++) {
+    slide = slides[i];
+    if (slide.properties.continued === "true" || slide.properties.count === "false") {
+      els[i - 1].className += ' has-continuation';
+    }
+  }
+  var s = d.createElement("style");
+  s.type = "text/css"; s.innerHTML = "@media print { .has-continuation { display: none; } }";
+  d.head.appendChild(s);
+})(document);
+// delete the temporary CSS (for displaying all slides initially) when the user
+// starts to view slides
+(function() {
+  var deleted = false;
+  slideshow.on('beforeShowSlide', function(slide) {
+    if (deleted) return;
+    var sheets = document.styleSheets, node;
+    for (var i = 0; i < sheets.length; i++) {
+      node = sheets[i].ownerNode;
+      if (node.dataset["target"] !== "print-only") continue;
+      node.parentNode.removeChild(node);
+    }
+    deleted = true;
+  });
+})();
+// add `data-at-shortcutkeys` attribute to <body> to resolve conflicts with JAWS
+// screen reader (see PR #262)
+(function(d) {
+  let res = {};
+  d.querySelectorAll('.remark-help-content table tr').forEach(tr => {
+    const t = tr.querySelector('td:nth-child(2)').innerText;
+    tr.querySelectorAll('td:first-child .key').forEach(key => {
+      const k = key.innerText;
+      if (/^[a-z]$/.test(k)) res[k] = t;  // must be a single letter (key)
+    });
+  });
+  d.body.setAttribute('data-at-shortcutkeys', JSON.stringify(res));
+})(document);
+(function() {
+  "use strict"
+  // Replace <script> tags in slides area to make them executable
+  var scripts = document.querySelectorAll(
+    '.remark-slides-area .remark-slide-container script'
+  );
+  if (!scripts.length) return;
+  for (var i = 0; i < scripts.length; i++) {
+    var s = document.createElement('script');
+    var code = document.createTextNode(scripts[i].textContent);
+    s.appendChild(code);
+    var scriptAttrs = scripts[i].attributes;
+    for (var j = 0; j < scriptAttrs.length; j++) {
+      s.setAttribute(scriptAttrs[j].name, scriptAttrs[j].value);
+    }
+    scripts[i].parentElement.replaceChild(s, scripts[i]);
+  }
+})();
+(function() {
+  var links = document.getElementsByTagName('a');
+  for (var i = 0; i < links.length; i++) {
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+    }
+  }
+})();
+// adds .remark-code-has-line-highlighted class to <pre> parent elements
+// of code chunks containing highlighted lines with class .remark-code-line-highlighted
+(function(d) {
+  const hlines = d.querySelectorAll('.remark-code-line-highlighted');
+  const preParents = [];
+  const findPreParent = function(line, p = 0) {
+    if (p > 1) return null; // traverse up no further than grandparent
+    const el = line.parentElement;
+    return el.tagName === "PRE" ? el : findPreParent(el, ++p);
+  };
+
+  for (let line of hlines) {
+    let pre = findPreParent(line);
+    if (pre && !preParents.includes(pre)) preParents.push(pre);
+  }
+  preParents.forEach(p => p.classList.add("remark-code-has-line-highlighted"));
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+
+<script>
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+      if (/^\\\((.|\s)+\\\)$/.test(text) || /^\\\[(.|\s)+\\\]$/.test(text) ||
+          /^\$\$(.|\s)+\$\$$/.test(text) ||
+          /^\\begin\{([^}]+)\}(.|\s)+\\end\{[^}]+\}$/.test(text)) {
+        code.outerHTML = code.innerHTML;  // remove <code></code>
+        continue;
+      }
+    }
+    i++;
+  }
+};
+slideshow._releaseMath(document);
+</script>
+<!-- dynamically load mathjax for compatibility with self-contained -->
+<script>
+(function () {
+  var script = document.createElement('script');
+  script.type = 'text/javascript';
+  script.src  = 'https://mathjax.rstudio.com/latest/MathJax.js?config=TeX-MML-AM_CHTML';
+  if (location.protocol !== 'file:' && /^https?:/.test(script.src))
+    script.src  = script.src.replace(/^https?:/, '');
+  document.getElementsByTagName('head')[0].appendChild(script);
+})();
+</script>
+  </body>
+</html>
