Unable to create an issue with this text:

gistfile1.txt

DTHTMLWriter does not correctly encode emoji unicode sequences.

It outputs this:

    Here is a Smiley: �� and Mr. Poop: ��

which does not display as Emoji in Safari.

NSHTMLWriter does not encode them at all:

    <p class="p1"><span class="s1">Here</span><span class="s2"> is a</span>
    <span class="s1"> </span><span class="s3">Smil</span><span class="s1">e</span>
    <span class="s4">y: 😄</span><span class="s1"> and Mr. Poop: 💩</span></p>

Mail.app does something weird that I don't understand either. It has some sort of equal sign encoding:

    Here is a Smiley: <span style=3D"font-size: 11px; =font-family: 'Apple Color Emoji'; ">=F0=9F=98=84</span>

I am at a loss what the correct way is. I have a feeling that it should be encoded for safety.