Fix conflict in with KaTeX and Require.js

news/changelog-1.7.md

@@ -120,6 +120,7 @@ All changes included in 1.7:
 ### `jupyter`
 
 - ([#9089](https://github.com/quarto-dev/quarto-cli/issues/9089)): Serialize compound `jupyter` metadata into a special key-value attribute to not break Pandoc's fenced div parsing.
+- ([#10113](https://github.com/quarto-dev/quarto-cli/issues/10113)): KaTeX will now load correctly in `engine: jupyter` documents using `emebed-resources: true`.
 - ([#12114](https://github.com/quarto-dev/quarto-cli/issues/12114)): `JUPYTERCACHE` environment variable from [Jupyter cache CLI](https://jupyter-cache.readthedocs.io/en/latest/using/cli.html) is now respected by Quarto when `cache: true` is used. This environment variable allows to change the path of the cache directory.
 - ([#12228](https://github.com/quarto-dev/quarto-cli/issues/12228)): `quarto render` will now fails if errors are detected at IPython display level. Setting `error: true` globally or at cell level will keep the error to show in output and not stop the rendering.
 - ([#12374](https://github.com/quarto-dev/quarto-cli/issues/12374)): Detect language properly in Jupyter notebooks that lack the `language` field in their `kernelspec`s.

src/command/render/template.ts

@@ -270,26 +270,47 @@ function katexScript(url: string) {
       link.rel = "stylesheet";
       link.href = "${url}katex.min.css";
       head.appendChild(link);
-
-      var script = document.createElement("script");
-      script.type = "text/javascript";
-      script.src  = "${url}katex.min.js";
-      script.async = false;
-      script.addEventListener('load', function() {
+
+      function renderMathElements() {
         var mathElements = document.getElementsByClassName("math");
-          var macros = [];
-          for (var i = 0; i < mathElements.length; i++) {
-            var texText = mathElements[i].firstChild;
-            if (mathElements[i].tagName == "SPAN") {
+        var macros = [];
+        for (var i = 0; i < mathElements.length; i++) {
+          var texText = mathElements[i].firstChild;
+          if (mathElements[i].tagName == "SPAN") {
+            if (window.katex) {
               window.katex.render(texText.data, mathElements[i], {
                 displayMode: mathElements[i].classList.contains('display'),
                 throwOnError: false,
                 macros: macros,
                 fleqn: false
               });
+            } else {
+              console.error("KaTeX has not been loaded correctly, as not found globally.");
             }
           }
-      });
+        }
+      }
+
+      var script = document.createElement("script");
+      script.src = "${url}katex.min.js";
+      script.onload = renderMathElements;
+
+      // Check for RequireJS and AMD detection as it conflicts with KaTeX loading.
+      if (typeof require === 'function' && typeof define === 'function' && define.amd) {
+        // Disable require.js AMD detection temporarily, as it conflicts with KaTeX loading using CommonJS
+        var disableAmdScript = document.createElement("script");
+        disableAmdScript.textContent = 'window._amd_backup = window.define.amd; window.define.amd = false;';
+        head.appendChild(disableAmdScript);
+
+        // overwrite onload to restore Require.js AMD detection
+        script.onload = function() {
+          // Restore Require.js AMD detection
+          window.define.amd = window._amd_backup;
+          delete window._amd_backup;
+          renderMathElements();
+        };
+      }
+
       head.appendChild(script);
     });
   </script>

tests/docs/playwright/html/math/katex/embed-except-math.qmd

@@ -0,0 +1,12 @@
+---
+format: html
+html-math-method: katex
+embed-resources: true
+---
+
+$\alpha$
+
+```{python}
+import pandas as pd
+pd.DataFrame([1])
+```

tests/docs/playwright/html/math/katex/embed-with-math.qmd

@@ -0,0 +1,13 @@
+---
+format: html
+html-math-method: katex
+embed-resources: true
+self-contained-math: true
+---
+
+$\alpha$
+
+```{python}
+import pandas as pd
+pd.DataFrame([1])
+```

tests/docs/playwright/html/math/katex/not-embed.qmd

@@ -0,0 +1,11 @@
+---
+format: html
+html-math-method: katex
+---
+
+$\alpha$
+
+```{python}
+import pandas as pd
+pd.DataFrame([1])
+```

tests/integration/playwright/tests/html-math-katex.spec.ts

@@ -0,0 +1,17 @@
+import { test, expect } from '@playwright/test';
+
+test.describe('KaTeX math rendering in Jupyter engine document', () => {
+  const testCases = [
+    { url: 'html/math/katex/not-embed.html', description: 'not embedding resources' },
+    { url: 'html/math/katex/embed-with-math.html', description: 'embedding resources including Math' },
+    { url: 'html/math/katex/embed-except-math.html', description: 'embedding resources except Math' }
+  ];
+
+  for (const { url, description } of testCases) {
+    test(`KaTeX math is rendered while ${description}`, async ({ page }) => {
+      await page.goto(url);
+      // Check that math is rendered
+      await expect(page.locator("span.katex")).toContainText('α');
+    });
+  }
+});