See here for the tool I mentioned, for producing any normal (plane-one) character pasting into Mudcat (checkbox checked) or into other programmes or websites (checkbox unchecked).

John, unfortunately Unicode has quite a number of logical flaws, and so has HTML. If the gods wanted to give us a universal standard for editing and sharing sheet music without having to resort to pixel images, they would not use an extention of Unicode, but something like ABC, e.g. imbeddable into HTML code so that browsers would make black dots out of it. That is not a technical problem - plugins can do it right now - but one of standardization.

Anyway, those gods don't think any serious person wants to read sheet music.