Refer to Welsh in the Letter Database
This utf-8 coded document offers those characters which are
not in the Latin-1 repertoire, both as &#number;
representations and as utf-8 coded characters.
Disclaimer: I don't speak or read Welsh: this
test page is only for the purpose of testing
the character-display technology in web browsers.
A.Prilop also offers a test
page for &#number; representations
and another
page with the utf-8 coded characters, covering these characters and
many more.
The two forms should be identical as far as HTML is concerned, but
some differences are still observed in currently-available browsers.