Simon, is it possible to add an "Underline" button to options?

Wonderment

Simon, is it possible to add an "Underline" button to the available options?
Thanks again for this site!
Simon

Yes, probably - I'm working on a new editor with @mentions and #hashtags so will include it in that.
Doctor Who

H̲e̲l̲l̲o̲ !
Simon

Sorcery!
Although there are easier ways to do it than unicode witchcraftery :)
Doctor Who

S̲o̲r̲r̲y̲ ̲S̲i̲m̲o̲n̲,̲ ̲I̲ ̲a̲m̲ ̲O̲L̲D̲ ̲s̲c̲h̲o̲o̲l̲!̲ ̲ ̲L̲O̲L̲!̲
zeb

~~whats all this about underlining?~~
Vidiot

~~Bolditaliccrossoutunderlinequote!!!~~
eyeuse2badub

What's the 'underlying' reason you need underlining?
just saying!
amiable atheist

If you want to underline your text, …

The above paragraph in HTML looks like this:

<p>If you want to <u>underline</u> your text, …
</p>
The </> button on the right is for HTML editing.
jp1692

I'm no a MAC. I just highlight what I want underlined and hit COMMAND-U.
It works.