docs(configuration): document HTML module extraction options

Add module.generator.html.extract and the matching output.htmlFilename /
output.htmlChunkFilename templates introduced in webpack 5.107.0 for the
experimental HTML module pipeline.

Author: alexander-akait

src/content/configuration/module.mdx

@@ -200,6 +200,13 @@ export default {
         // Use `JSON.parse` when the JSON string is longer than 20 characters.
         parse: JSONParse,
       },
+      html: {
+        // Generator options for html modules, requires `experiments.html`, available since webpack 5.107.0
+
+        // Emit the parsed and URL-rewritten HTML as a standalone .html output file.
+        // type: boolean | 'inline'
+        extract: true,
+      },
       // others…
     },
   },
@@ -235,6 +242,35 @@ console.log(styles.btn); // hashed class
 console.log(styles.BTN); // same hashed class, uppercase alias
 ```
 
+### module.generator.html.extract
+
+<Badge text="5.107.0+" />
+
+`boolean = true` `'inline'`
+
+Controls whether an [HTML module](/configuration/experiments/#experimentshtml) emits its parsed and URL-rewritten HTML as a standalone `.html` output file alongside the module's JavaScript export, mirroring the CSS extraction pipeline. Requires [`experiments.html`](/configuration/experiments/#experimentshtml).
+
+- `true` - always emit the `.html` file.
+- `false` - never emit it.
+- `'inline'` - expose the processed HTML for inline write-back (e.g. `<iframe srcdoc>`) without emitting a standalone file.
+
+When unset, extraction defaults to `true` for HTML modules used as compilation entries (HTML entry points) and `false` for HTML modules imported from JavaScript. The emitted filenames follow [`output.htmlFilename`](/configuration/output/#outputhtmlfilename) and [`output.htmlChunkFilename`](/configuration/output/#outputhtmlchunkfilename).
+
+**webpack.config.js**
+
+```js
+export default {
+  experiments: { html: true },
+  module: {
+    generator: {
+      html: {
+        extract: true,
+      },
+    },
+  },
+};
+```
+
 ## module.parser
 
 <Badge text="5.12.0+" />

src/content/configuration/output.mdx

@@ -904,6 +904,44 @@ export default {
 
 It can be overridden per entry through the [entry descriptor](/configuration/entry-context/#entry-descriptor) `html` option.
 
+## output.htmlFilename
+
+<Badge text="5.107.0+" />
+
+`string = output.filename with '.js' replaced by '.html'` `function (pathData, assetInfo) => string`
+
+The filename template for HTML files emitted by [extracted HTML modules](/configuration/module/#modulegeneratorhtmlextract) (initial chunks). It works like [`output.filename`](#outputfilename) and supports the same [template strings](#template-strings). When unset, it is derived from `output.filename` by swapping the `.js` extension for `.html` (falling back to `[name].html` when `output.filename` is a function), mirroring how `cssFilename` derives from `filename`.
+
+```js
+// webpack.config.js
+export default {
+  experiments: { html: true },
+  output: {
+    htmlFilename: "[name].html",
+  },
+};
+```
+
+W> You must **not** specify an absolute path here. The path may contain folders separated by `/`, and is joined with [`output.path`](#outputpath) to determine the location on disk.
+
+## output.htmlChunkFilename
+
+<Badge text="5.107.0+" />
+
+`string = output.chunkFilename with '.js' replaced by '.html'` `function (pathData, assetInfo) => string`
+
+The filename template for HTML files emitted by [extracted HTML modules](/configuration/module/#modulegeneratorhtmlextract) for non-initial (on-demand) chunks. It defaults from [`output.chunkFilename`](#outputchunkfilename) the same way `htmlFilename` defaults from `filename`.
+
+```js
+// webpack.config.js
+export default {
+  experiments: { html: true },
+  output: {
+    htmlChunkFilename: "[name].chunk.html",
+  },
+};
+```
+
 ## output.iife
 
 `boolean = true`