>>> within a paragraph
I love to :smile:.

<<<
<p>I love to 😄.</p>
>>> within other inline syntax
I *love to :smile:*
<<<
<p>I <em>love to 😄</em></p>
>>> within blockquote
> I love to :smile:.
<<<
<blockquote>
<p>I love to 😄.</p>
</blockquote>
>>> within code block
    I love to :smile:
<<<
<pre><code>I love to :smile:
</code></pre>
>>> within a link
I love [to :smile:](http://www.google.com).
<<<
<p>I love <a href="http://www.google.com">to 😄</a>.</p>
>>> within a reference link
I love [to :smile:][].

[to :smile:]: http://www.google.com
<<<
<p>I love <a href="http://www.google.com">to 😄</a>.</p>
>>> within inline code
I love to `:smile:`.
<<<
<p>I love to <code>:smile:</code>.</p>
>>> with multiple code points
Yay :australia:
<<<
<p>Yay 🇦🇺</p>
>>> leaves unknown emojis alone
I love :smiles:.
<<<
<p>I love :smiles:.</p>