While I expected tex not to work for notebook titles when displayed on your profile, I did expect html entities to work correctly.
For example, for this notebook:
The only way I could get the Complex Numbers sign to show up was pasting it as actual utf-8 code. Neither tex nor the html entity ℂ would show up in the title.
No big deal - just noticing.
The html entity works for me in Chrome on Linux. See fork.
I confused title with header, eg. forgot what ‘title’ means in Observable. Please ignore.
Titles are currently treated as plain text, so unfortunately you can’t currently embed HTML entities such as
‒ in them. And likewise you can’t embed LaTeX.
However, you can use Unicode characters such as
ℂ (as you discovered) or Unicode escapes such as
I’d like to make our title extractor smarter! We’ll keep this case in mind.