diff --git a/content/en/about/features.md b/content/en/about/features.md
index 44b00996f..cfd9d3451 100644
--- a/content/en/about/features.md
+++ b/content/en/about/features.md
@@ -46,7 +46,7 @@ toc: true
 : Apply HTML attributes such as `class` and `id` to Markdown images and block elements including blockquotes, fenced code blocks, headings, horizontal rules, lists, paragraphs, and tables.
 
 [Markdown extensions]
-: Leverage the embedded Markdown extensions to create tables, definition lists, footnotes, task lists, and more.
+: Leverage the embedded Markdown extensions to create tables, definition lists, footnotes, task lists, inserted text, mark test, subscripts, superscripts, and more.
 
 [Markdown render hooks]
 : Override the conversion of Markdown to HTML when rendering fenced code blocks, headings, images, and links. For example, render every standalone image as an HTML `figure` element.
diff --git a/content/en/getting-started/configuration-markup.md b/content/en/getting-started/configuration-markup.md
index f5b546003..ab3dfa221 100644
--- a/content/en/getting-started/configuration-markup.md
+++ b/content/en/getting-started/configuration-markup.md
@@ -58,23 +58,20 @@ This is the default configuration for the Goldmark Markdown renderer:
 
 ### Goldmark extensions
 
-The extensions below, excluding passthrough, are enabled by default.
+The extensions below, excluding Extras and Passthrough, are enabled by default.
 
-Enable the passthrough extension if you include mathematical equations and expressions in your Markdown using LaTeX or TeX typesetting syntax. See [mathematics in Markdown] for details.
-
-[mathematics in Markdown]: content-management/mathematics/
-
-Extension|Documentation
-:--|:--
-cjk|[Goldmark Extensions: CJK]
-definitionList|[PHP Markdown Extra: Definition lists]
-footnote|[PHP Markdown Extra: Footnotes]
-linkify|[GitHub Flavored Markdown: Autolinks]
-passthrough|[Hugo Goldmark Extensions: Passthrough]
-strikethrough|[GitHub Flavored Markdown: Strikethrough]
-table|[GitHub Flavored Markdown: Tables]
-taskList|[GitHub Flavored Markdown: Task list items]
-typographer|[Goldmark Extensions: Typographer]
+Extension|Documentation|Enabled
+:--|:--|:-:
+cjk|[Goldmark Extensions: CJK]|:heavy_check_mark:
+definitionList|[PHP Markdown Extra: Definition lists]|:heavy_check_mark:
+extras|[Hugo Goldmark Extensions: Extras]|
+footnote|[PHP Markdown Extra: Footnotes]|:heavy_check_mark:
+linkify|[GitHub Flavored Markdown: Autolinks]|:heavy_check_mark:
+passthrough|[Hugo Goldmark Extensions: Passthrough]|
+strikethrough|[GitHub Flavored Markdown: Strikethrough]|:heavy_check_mark:
+table|[GitHub Flavored Markdown: Tables]|:heavy_check_mark:
+taskList|[GitHub Flavored Markdown: Task list items]|:heavy_check_mark:
+typographer|[Goldmark Extensions: Typographer]|:heavy_check_mark:
 
 [GitHub Flavored Markdown: Autolinks]: https://github.github.com/gfm/#autolinks-extension-
 [GitHub Flavored Markdown: Strikethrough]: https://github.github.com/gfm/#strikethrough-extension-
@@ -82,11 +79,40 @@ typographer|[Goldmark Extensions: Typographer]
 [GitHub Flavored Markdown: Task list items]: https://github.github.com/gfm/#task-list-items-extension-
 [Goldmark Extensions: CJK]: https://github.com/yuin/goldmark?tab=readme-ov-file#cjk-extension
 [Goldmark Extensions: Typographer]: https://github.com/yuin/goldmark?tab=readme-ov-file#typographer-extension
+[Hugo Goldmark Extensions: Extras]: https://github.com/gohugoio/hugo-goldmark-extensions?tab=readme-ov-file#extras-extension
 [Hugo Goldmark Extensions: Passthrough]: https://github.com/gohugoio/hugo-goldmark-extensions?tab=readme-ov-file#passthrough-extension
 [PHP Markdown Extra: Definition lists]: https://michelf.ca/projects/php-markdown/extra/#def-list
 [PHP Markdown Extra: Footnotes]: https://michelf.ca/projects/php-markdown/extra/#footnotes
 
-The typographer extension replaces certain character combinations with HTML entities as specified below:
+#### Extras extension
+
+{{< new-in 0.126.0 >}}
+
+Configure the extras extension to enable [inserted text], [mark text], [subscript], and [superscript] elements in Markdown.
+
+Element|Markdown|Rendered
+:--|:--|:--
+Inserted text|`++foo++`|`<ins>foo</ins>`
+Mark text|`==bar==`|`<mark>bar</mark>`
+Subscript|`H~2~O`|`H<sub>2</sub>O`
+Superscript|`1^st^`|`1<sup>st</sup>`
+
+[inserted text]: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/ins
+[mark text]: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/mark
+[subscript]: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/sub
+[superscript]: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/sup
+
+#### Passthrough extension
+
+{{< new-in 0.122.0 >}}
+
+Enable the passthrough extension to include mathematical equations and expressions in Markdown using LaTeX or TeX typesetting syntax. See [mathematics in Markdown] for details.
+
+[mathematics in Markdown]: content-management/mathematics/
+
+#### Typographer extension
+
+The Typographer extension replaces certain character combinations with HTML entities as specified below:
 
 Markdown|Replaced by|Description
 :--|:--|:--
diff --git a/data/docs.yaml b/data/docs.yaml
index dcc96c590..036c21285 100644
--- a/data/docs.yaml
+++ b/data/docs.yaml
@@ -1065,6 +1065,15 @@ config:
           enable: false
           escapedSpace: false
         definitionList: true
+        extras:
+          insert:
+            enable: false
+          mark:
+            enable: false
+          subscript:
+            enable: false
+          superscript:
+            enable: false
         footnote: true
         linkify: true
         linkifyProtocol: https