hfy-flatten-style

hfy-flatten-style is a compiled Lisp function in `htmlfontify.el'.

(hfy-flatten-style STYLE)

Take STYLE (see `hfy-face-to-style-i', `hfy-face-to-style') and merge
any multiple attributes appropriately. Currently only font-size is merged
down to a single occurrence - others may need special handling, but I
haven't encountered them yet. Returns a `hfy-style-assoc'.