Re: small phi font problem

I am trying to summarize the small-phi font problem, as it appears to
me, from the exchange of emails by MathML users of this list,
who helped me to understand and to crystalize the problem.

1. There are two small-phi fonts that are used for different purposes
in
math:
    a) curly small letter phi font (known from Latex as varphi)
    b) a miniaturized capital phi (known from Latex as straightphi)

2. According to the more recent definition of Unicode (see  e.g.
   "http://www.w3.org/TR/xml-entity-names/#diff-mathml2")
   φ (φ) corresponds to the above 1a,
   and ϕ (ϕ) corresponds to the above 1b.

3. It is imperative that all browsers, in any appropriate operating
system,
be compatible, and use the same rule for rendering these fonts.

4. It is natural to use the Unicode rule (point 2 above), which is
already
adopted for Windows by Firefox 3b (Minefield trunk).
It should be applied also for other platforms (e.g. Mac).

Did I miss or misinterpret something?
Does someone know what rule is applied for Unix, or Linux?

Thanks, Samy