Disable thickening MathJax strokes in print media

CHANGELOG.md

@@ -2,6 +2,19 @@
 
 ## [Unreleased]
 
+### Added
+
+- Transform Unicode 14.0 emojis into images ([#289](https://github.com/marp-team/marp-core/pull/289))
+
+### Fixed
+
+- Disable thickening MathJax strokes in print media ([#287](https://github.com/marp-team/marp-core/issues/287), [#290](https://github.com/marp-team/marp-core/pull/290))
+
+### Changed
+
+- Upgrade Marpit to [v2.2.3](https://github.com/marp-team/marpit/releases/v2.2.3) ([#289](https://github.com/marp-team/marp-core/pull/289))
+- Upgrade Node and dependent packages to the latest version ([#289](https://github.com/marp-team/marp-core/pull/289))
+
 ## v2.3.2 - 2022-01-23
 
 ### Fixed

src/math/mathjax.scss

@@ -0,0 +1,14 @@
+/**
+ * Disable thickening strokes in print media (e.g. PDF).
+ *
+ * https://github.com/mathjax/MathJax-src/blob/2dd53ce6c8af3c9cceba0baf014ea9b065130774/ts/output/svg/Wrappers/TextNode.ts#L49-L53
+ * https://github.com/marp-team/marp-core/issues/287
+ */
+@media print {
+  mjx-container[jax='SVG'] {
+    use[data-c],
+    path[data-c] {
+      stroke-width: 0;
+    }
+  }
+}

src/math/mathjax.ts

@@ -5,6 +5,7 @@ import { AllPackages } from 'mathjax-full/js/input/tex/AllPackages'
 import { mathjax } from 'mathjax-full/js/mathjax'
 import { SVG } from 'mathjax-full/js/output/svg'
 import { getMathContext, setMathContext } from './context'
+import mathjaxScss from './mathjax.scss'
 
 interface MathJaxContext {
   adaptor: LiteAdaptor
@@ -69,4 +70,4 @@ export const block = (marpit: any) =>
     { scaled: true }
   )
 
-export const css = (marpit: any) => context(marpit).css
+export const css = (marpit: any) => context(marpit).css + '\n' + mathjaxScss