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+title:      HeaderId Extension
+prev_title: HTML Tidy Extension
+prev_url:   html_tidy.html
+next_title: Meta-Data Extension
+next_url:   meta_data.html
+
+HeaderId
+========
+
+Summary
+-------
+
+An extension to Python-Markdown that automatically generates 'id' attributes
+for HTML header elements (h1-h6) in markdown's output.
+
+This extension is included in the standard Markdown library.
+
+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":
+
+    #Header
+    #Header
+    #Header
+
+Results in:
+
+    <h1 id="header">Header</h1>
+    <h1 id="header_1">Header</h1>
+    <h1 id="header_2">Header</h1>
+
+Configuring the Output
+----------------------
+
+The HeaderId extension has four configuration settings:
+
+* **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:
+
+        >>>  text = '''
+        ... #Some Header
+        ... ## Next Level'''
+        >>> html = markdown.markdown(text, extensions=['headerid(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 attr_list 
+    extension).
+
+        >>> text = '''
+        ... # Some Header
+        ... # Header with ID # { #foo }'''
+        >>> html = markdown.markdown(text, 
+                        extensions=['attr_list', 'headerid(forceid=False)'])
+        >>> print html
+        <h1>Some Header</h1>
+        <h1 id="foo">Header with ID</h1>
+
+* **separator**: Word separator. Character which replaces whitespace 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.html) 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:
+
+    header_level: 2
+    header_forceid: Off
+
+    # A Header
+
+
+Will result in the following output:
+
+    <h2>A Header</h2>