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## Implicit heading references (extension)
The `implicit_heading_references` causes headings to create
reference links to themselves. One can use this
with the `auto_identifiers` extension, which should be
put first in the list of extensions, or one can
define identifiers for the headings manually by
putting an attribute block before the heading.
```````````````````````````````` example
# Heading
See the [Heading] above.
.
<h1 id="heading">Heading</h1>
<p>See the <a href="#heading">Heading</a> above.</p>
````````````````````````````````
```````````````````````````````` example
{#foo}
# Heading
See the [Heading] above.
.
<h1 id="foo">Heading</h1>
<p>See the <a href="#foo">Heading</a> above.</p>
````````````````````````````````
Explicitly defined references take precedence:
```````````````````````````````` example
# Heading
See the [Heading] above.
[Heading]: foo
.
<h1 id="heading">Heading</h1>
<p>See the <a href="foo">Heading</a> above.</p>
````````````````````````````````
When there are two headings with the same text,
the first takes precedence:
```````````````````````````````` example
# Heading
# Heading
See the [Heading] above.
.
<h1 id="heading">Heading</h1>
<h1 id="heading-1">Heading</h1>
<p>See the <a href="#heading">Heading</a> above.</p>
````````````````````````````````
Empty headings don't create implicit references:
```````````````````````````````` example
#
##
See [] and [ ].
.
<h1 id=""></h1>
<h2 id="-1"></h2>
<p>See [] and [ ].</p>
````````````````````````````````
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