>>> footnote reference in footnote definition

Footnote 1 link[^first].

[^first]: footnote reference in footnote definition[^first]

<<<
<p>Footnote 1 link<sup class="footnote-ref"><a href="#fn-first" id="fnref-first">1</a></sup>.</p>
<section class="footnotes">
<ol>
<li id="fn-first">
<p>footnote reference in footnote definition<sup class="footnote-ref"><a href="#fn-first" id="fnref-first-2">1</a></sup> <a href="#fnref-first" class="footnote-backref">↩</a> <a href="#fnref-first-2" class="footnote-backref">↩<sup class="footnote-ref">2</sup></a></p>
</li>
</ol>
</section>
>>> footnote reference cases
[^fifth]: ending with another ']' and different order

Footnote 1 link[^first].

Footnote 2 link[^きゃくちゅう脚注].

Footnote 3 link[^p1 p2].

Footnote 4 link![^forth].

Footnote 5 link![^fifth]].

Footnote 6 link![^ sixth ].

Footnote 7 link[^きゃくちゅう脚注].

[^first]: Here is the footnote definition

[^きゃくちゅう脚注]: unicode label and duplicated reference.

[^p1 p2]: p1 p2

[^ForTh]: start with '[' and with upper case

[^sixth]: label-start-with-blank
<<<
<p>Footnote 1 link<sup class="footnote-ref"><a href="#fn-first" id="fnref-first">1</a></sup>.</p>
<p>Footnote 2 link<sup class="footnote-ref"><a href="#fn-%E3%81%8D%E3%82%83%E3%81%8F%E3%81%A1%E3%82%85%E3%81%86%E8%84%9A%E6%B3%A8" id="fnref-%E3%81%8D%E3%82%83%E3%81%8F%E3%81%A1%E3%82%85%E3%81%86%E8%84%9A%E6%B3%A8">2</a></sup>.</p>
<p>Footnote 3 link[^p1 p2].</p>
<p>Footnote 4 link!<sup class="footnote-ref"><a href="#fn-ForTh" id="fnref-ForTh">3</a></sup>.</p>
<p>Footnote 5 link!<sup class="footnote-ref"><a href="#fn-fifth" id="fnref-fifth">4</a></sup>].</p>
<p>Footnote 6 link!<sup class="footnote-ref"><a href="#fn-sixth" id="fnref-sixth">5</a></sup>.</p>
<p>Footnote 7 link<sup class="footnote-ref"><a href="#fn-%E3%81%8D%E3%82%83%E3%81%8F%E3%81%A1%E3%82%85%E3%81%86%E8%84%9A%E6%B3%A8" id="fnref-%E3%81%8D%E3%82%83%E3%81%8F%E3%81%A1%E3%82%85%E3%81%86%E8%84%9A%E6%B3%A8-2">2</a></sup>.</p>
<p>[^p1 p2]: p1 p2</p>
<section class="footnotes">
<ol>
<li id="fn-first">
<p>Here is the footnote definition <a href="#fnref-first" class="footnote-backref">↩</a></p>
</li>
<li id="fn-%E3%81%8D%E3%82%83%E3%81%8F%E3%81%A1%E3%82%85%E3%81%86%E8%84%9A%E6%B3%A8">
<p>unicode label and duplicated reference. <a href="#fnref-%E3%81%8D%E3%82%83%E3%81%8F%E3%81%A1%E3%82%85%E3%81%86%E8%84%9A%E6%B3%A8" class="footnote-backref">↩</a> <a href="#fnref-%E3%81%8D%E3%82%83%E3%81%8F%E3%81%A1%E3%82%85%E3%81%86%E8%84%9A%E6%B3%A8-2" class="footnote-backref">↩<sup class="footnote-ref">2</sup></a></p>
</li>
<li id="fn-ForTh">
<p>start with '[' and with upper case <a href="#fnref-ForTh" class="footnote-backref">↩</a></p>
</li>
<li id="fn-fifth">
<p>ending with another ']' and different order <a href="#fnref-fifth" class="footnote-backref">↩</a></p>
</li>
<li id="fn-sixth">
<p>label-start-with-blank <a href="#fnref-sixth" class="footnote-backref">↩</a></p>
</li>
</ol>
</section>
>>> footnote labels with special chars
empty label[^] and blank label[^ ]

some[^-] strange[^^] but[^\[] labels[^\[\]]

[^]:
[^ ]:

[^-]: valid1

[^^]:valid2

[^\[]: valid3

[^\[\]]: this-is-link-not-footnote
<<<
<p>empty label[^] and blank label[^ ]</p>
<p>some<sup class="footnote-ref"><a href="#fn--" id="fnref--">1</a></sup> strange<sup class="footnote-ref"><a href="#fn-%5E" id="fnref-%5E">2</a></sup> but<sup class="footnote-ref"><a href="#fn-%5C%5B" id="fnref-%5C%5B">3</a></sup> labels<a href="this-is-link-not-footnote">^[]</a></p>
<p>[^]:
[^ ]:</p>
<section class="footnotes">
<ol>
<li id="fn--">
<p>valid1 <a href="#fnref--" class="footnote-backref">↩</a></p>
</li>
<li id="fn-%5E">
<p>valid2 <a href="#fnref-%5E" class="footnote-backref">↩</a></p>
</li>
<li id="fn-%5C%5B">
<p>valid3 <a href="#fnref-%5C%5B" class="footnote-backref">↩</a></p>
</li>
</ol>
</section>
>>> footnote with paragraph
test footnote[^first].

[^first]: Footnote **can have markup**

    and multiple paragraphs.

"Smartypants, double quotes" and 'single quotes'
<<<
<p>test footnote<sup class="footnote-ref"><a href="#fn-first" id="fnref-first">1</a></sup>.</p>
<p>&quot;Smartypants, double quotes&quot; and 'single quotes'</p>
<section class="footnotes">
<ol>
<li id="fn-first">
<p>Footnote <strong>can have markup</strong></p>
<p>and multiple paragraphs. <a href="#fnref-first" class="footnote-backref">↩</a></p>
</li>
</ol>
</section>
>>> footnote adjacent paragraph
Here is a footnote reference,[^1]
[^1]: Here is the footnote.
    Subsequent paragraphs
<<<
<p>Here is a footnote reference,<sup class="footnote-ref"><a href="#fn-1" id="fnref-1">1</a></sup></p>
<section class="footnotes">
<ol>
<li id="fn-1">
<p>Here is the footnote.
Subsequent paragraphs <a href="#fnref-1" class="footnote-backref">↩</a></p>
</li>
</ol>
</section>
>>> footnote without ref
Here is a footnote reference
[^1]: Here is the footnote.
<<<
<p>Here is a footnote reference</p>
>>> footnote example from github
Here is a simple footnote[^1].

A footnote can also have multiple lines[^2].

You can also use words, to fit your writing style more closely[^note].

[^1]: My reference.
[^2]: Every new line should be prefixed with 2 spaces.
  This allows you to have a footnote with multiple lines.
[^note]:
    Named footnotes will still render with numbers instead of the text but allow easier identification and linking.
    This footnote also has been made with a different syntax using 4 spaces for new lines.
<<<
<p>Here is a simple footnote<sup class="footnote-ref"><a href="#fn-1" id="fnref-1">1</a></sup>.</p>
<p>A footnote can also have multiple lines<sup class="footnote-ref"><a href="#fn-2" id="fnref-2">2</a></sup>.</p>
<p>You can also use words, to fit your writing style more closely<sup class="footnote-ref"><a href="#fn-note" id="fnref-note">3</a></sup>.</p>
<section class="footnotes">
<ol>
<li id="fn-1">
<p>My reference. <a href="#fnref-1" class="footnote-backref">↩</a></p>
</li>
<li id="fn-2">
<p>Every new line should be prefixed with 2 spaces.
This allows you to have a footnote with multiple lines. <a href="#fnref-2" class="footnote-backref">↩</a></p>
</li>
<li id="fn-note">
<p>Named footnotes will still render with numbers instead of the text but allow easier identification and linking.
This footnote also has been made with a different syntax using 4 spaces for new lines. <a href="#fnref-note" class="footnote-backref">↩</a></p>
</li>
</ol>
</section>
>>> ![^  **image**] without definition should be formatted: unlike github
![^  **image**]
<<<
<p>![^  <strong>image</strong>]</p>
>>> ![^  **image**] with definition should be image: unlike github
![^  **image**]

[^  **image**]: valid-link
<<<
<p><img src="valid-link" alt="^  image" /></p>
>>> ![^  **image**] with definition should be plain html: unlike github
![^  **image**]

[^  **image**]: invalid link
<<<
<p>![^  <strong>image</strong>]</p>
<p>[^  <strong>image</strong>]: invalid link</p>
>>> ![ ^**image**] without definition should be formatted
![ ^**image**]
<<<
<p>![ ^<strong>image</strong>]</p>
>>> ![^ ^**image**] without definition should be formatted: unlike github
![^ ^**image**]
<<<
<p>![^ ^<strong>image</strong>]</p>
>>> ![^ ^**image**] with definition should be image: unlike github
![^ ^**image**]

[^ ^**image**]: valid-link
<<<
<p><img src="valid-link" alt="^ ^image" /></p>
>>> [^  **label**] without definition should be formatted: unlike github
[^  **label**]
<<<
<p>[^  <strong>label</strong>]</p>
>>> [adc][^**link**] without definition should be formatted: unlike github
[adc][^**link**]
<<<
<p>[adc][^<strong>link</strong>]</p>
>>> [adc][^**link**] with definition should be footnotes:
[adc][^**link**]

[^**link**]: valid-link
<<<
<p>[adc]<sup class="footnote-ref"><a href="#fn-**link**" id="fnref-**link**">1</a></sup></p>
<section class="footnotes">
<ol>
<li id="fn-**link**">
<p>valid-link <a href="#fnref-**link**" class="footnote-backref">↩</a></p>
</li>
</ol>
</section>
>>> \[^good] should be text
\[^good]

[^good]: good
<<<
<p>[^good]</p>
>>>[^ nice] should be link
[^ nice]

[^ nice ]: good
<<<
<p><a href="good">^ nice</a></p>
>>>[^ nice ] should be text
[^ nice ]

[^nice ]: good
<<<
<p>[^ nice ]</p>
>>> [^\]] with definition should be link
[^\]]

[^\]]: good
<<<
<p><a href="good">^]</a></p>
>>> [^a-\nb] with definition should be paragraph
[^a-
b]

[^a-
b]: good
<<<
<p><a href="good">^a-
b</a></p>
>>> [^a] with error definition should be text
[^a]

[^a\]: good
<<<
<p>[^a]</p>
>>> [^a] with double definition contain '\]' should be text
[^a]

[^a\]:]: definition contain '\]'
<<<
<p>[^a]</p>
>>> [^a] with double definition trailing should be footnote
[^a]

[^a]:]: good
<<<
<p><sup class="footnote-ref"><a href="#fn-a" id="fnref-a">1</a></sup></p>
<section class="footnotes">
<ol>
<li id="fn-a">
<p>]: good <a href="#fnref-a" class="footnote-backref">↩</a></p>
</li>
</ol>
</section>
>>> complete image link with definition would be image: unlike github
![^image](example.png)

[^image]: image footnote
<<<
<p><img src="example.png" alt="^image" /></p>