Re: C-comments in sgml-mode's html-mode

[martin rudalics <rudalics@gmx.at>]

 >>Some css-mode I presume.
 >
 >
 > That was my guess, too (see initial report).

I was aware of your guess.  By looking at the text properties I wanted
to exclude your guess about C.

 > However, C-h m gives me a buffer full of mode information in which
 > searching for css gets no hits, as does searching for helper.

C-h m won't tell about any remnants left by a mode in a buffer after the
mode has been turned off.  In your case someone has set up the syntax of
/ and * much as a css-mode would do.  What does C-h f css-mode say on
your system?