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-title: HeaderId Extension
-
-HeaderId
-========
-
-Summary
--------
-
-The HeaderId extension automatically generates `id` attributes for the header
-elements (`h1`-`h6`) in the resulting HTML document.
-
-This extension is included in the standard Markdown library.
-
-!!! warning
-    This extension is **Pending Deprecation**. The [Table of Contents][toc]
-    Extension should be used instead, which offers most the features of this
-    extension and more.
-
-[toc]: toc.md
-
-Syntax
-------
-
-By default, all headers will automatically have unique `id` attributes
-generated based upon the text of the header (see below to turn this off).
-Note this example, in which all three headers would have the same `id`:
-
-```md
-#Header
-#Header
-#Header
-```
-
-Results in:
-
-```html
-<h1 id="header">Header</h1>
-<h1 id="header_1">Header</h1>
-<h1 id="header_2">Header</h1>
-```
-
-Usage
------
-
-See [Extensions](index.md) for general extension usage, specify
-`markdown.extensions.headerid` as the name of the extension.
-
-See the [Library Reference](../reference.md#extensions) for information about
-configuring extensions.
-
-The following options are provided to configure the output:
-
-* **`level`**: Base level for headers.
-
-    Default: `1`
-
-    The `level` setting allows you to automatically adjust the header levels to
-    fit within the hierarchy of your HTML templates. For example, suppose the
-    markdown text for a page should not contain any headers higher than level 3
-    (`<h3>`). The following will accomplish that:
-
-        :::pycon
-        >>>  text = '''
-        ... #Some Header
-        ... ## Next Level'''
-        >>> from markdown.extensions.headerid import HeaderIdExtension
-        >>> html = markdown.markdown(text, extensions=[HeaderIdExtension(level=3)])
-        >>> print html
-        <h3 id="some_header">Some Header</h3>
-        <h4 id="next_level">Next Level</h4>'
-
-* **`forceid`**: Force all headers to have an id.
-
-    Default: `True`
-
-    The `forceid` setting turns on or off the automatically generated ids for
-    headers that do not have one explicitly defined (using the
-    [Attribute List](attr_list.md) extension).
-
-        :::pycon
-        >>> text = '''
-        ... # Some Header
-        ... # Header with ID # { #foo }'''
-        >>> html = markdown.markdown(text,
-                                     extensions=['markdown.extensions.attr_list',
-                                                 HeaderIdExtension(forceid=False)])
-        >>> print html
-        <h1>Some Header</h1>
-        <h1 id="foo">Header with ID</h1>
-
-* **`separator`**: Word separator. Character which replaces white space in id.
-
-    Default: `-`
-
-* **`slugify`**: Callable to generate anchors.
-
-    Default: `markdown.extensions.headerid.slugify`
-
-    If you would like to use a different algorithm to define the ids, you can
-    pass in a callable which takes two arguments:
-
-    * `value`: The string to slugify.
-    * `separator`: The Word Separator.
-
-Using with Meta-Data
---------------------
-
-The HeaderId extension also supports the [Meta-Data](meta_data.md) extension.
-Please see the documentation for that extension for specifics. The supported
-meta-data keywords are:
-
-* `header_level`
-* `header_forceid`
-
-When used, the meta-data will override the settings provided through the
-`extension_configs` interface.
-
-This document:
-
-```md
-header_level: 2
-header_forceid: Off
-
-# A Header
-```
-
-Will result in the following output:
-
-```html
-<h2>A Header</h2>
-```