Historical CommonMark edge cases.


## Links

Autolinks in link text stay literal.

```````````````````````````````` example
[<https://example.com>](/foo)
.
<p><a href="/foo">&lt;https://example.com&gt;</a></p>
````````````````````````````````

```````````````````````````````` example
[<name@example.com>](/foo)
.
<p><a href="/foo">&lt;name@example.com&gt;</a></p>
````````````````````````````````

```````````````````````````````` example
[[foo][]][bar]

[foo]: /foo
[bar]: /bar
.
<p>[<a href="/foo">foo</a>]<a href="/bar">bar</a></p>
````````````````````````````````

## Emphasis

CommonMark delimiter handling is the default.

```````````````````````````````` example
*_em_* __**strong**__ ______m______
.
<p><em><em>em</em></em> <strong><strong>strong</strong></strong> <strong><strong><strong>m</strong></strong></strong></p>
````````````````````````````````

```````````````````````````````` example
*a **b c* d**
.
<p><em>a <em><em>b c</em> d</em></em></p>
````````````````````````````````

```````````````````````````````` example
*a **b c* d**
.
<p><em>a <em><em>b c</em> d</em></em></p>
````````````````````````````````

```````````````````````````````` example
*a **b c* d
.
<p>*a *<em>b c</em> d</p>
````````````````````````````````


## Max depth


```````````````````````````````` example
> > > > > > > > b
.
<blockquote>
<blockquote>
<blockquote>
<blockquote>
<blockquote>
<blockquote>
<blockquote>
<blockquote>
<p>b</p>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
````````````````````````````````


```````````````````````````````` example
- a
  - b
    - c
      - d
        - e
          - f
            - g
              - h
.
<ul>
<li>a<ul>
<li>b<ul>
<li>c<ul>
<li>d<ul>
<li>e<ul>
<li>f<ul>
<li>g<ul>
<li>h</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
</ul>
````````````````````````````````
