Merge commit '8b9803425e63e1b1801f8d5d676e96368d706722'

docs/content/en/render-hooks/_common/_index.md

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+---
+cascade:
+  _build:
+    list: never
+    publishResources: false
+    render: never
+---
+
+<!--
+Files within this headless branch bundle are Markdown snippets. Each file must contain front matter delimiters, though front matter fields are not required.
+
+Include the rendered content using the "include" shortcode. 
+-->

docs/content/en/render-hooks/_common/pageinner.md

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+---
+# Do not remove front matter.
+---
+
+## PageInner details
+
+{{< new-in 0.125.0 >}}
+
+The primary use case for `PageInner` is to resolve links and [page resources] relative to an included `Page`. For example, create an "include" shortcode to compose a page from multiple content files, while preserving a global context for footnotes and the table of contents:
+
+{{< code file=layouts/shortcodes/include.html >}}
+{{ with site.GetPage (.Get 0) }}
+  {{ .RenderShortcodes }}
+{{ end }}
+{{< /code >}}
+
+Then call the shortcode in your Markdown:
+
+{{< code file=content/posts/p1.md >}}
+{{%/* include "/posts/p2" */%}}
+{{< /code >}}
+
+Any render hook triggered while rendering `/posts/p2` will get:
+
+- `/posts/p1` when calling `Page`
+- `/posts/p2` when calling `PageInner`
+
+`PageInner` falls back to the value of `Page` if not relevant, and always returns a value.
+
+{{% note %}}
+The `PageInner` method is only relevant for shortcodes that invoke the [`RenderShortcodes`] method, and you must call the shortcode using the `{{%/*..*/%}}` notation.
+
+[`RenderShortcodes`]: /methods/page/rendershortcodes/
+{{% /note %}}
+
+As a practical example, Hugo's embedded link and image render hooks use the `PageInner` method to resolve markdown link and image destinations. See the source code for each:
+
+- [Embedded link render hook]({{% eturl render-link %}})
+- [Embedded image render hook]({{% eturl render-image %}})
+
+[`RenderShortcodes`]: /methods/page/rendershortcodes/
+[page resources]: /getting-started/glossary/#page-resource