Hi Nasser,
> breqn is only needed in pdf mode due to limited page width
> and not in HTML mode. tex4ht does not support breqn, which is OK,
> as not really needed for HTML.
>
I think we should really support breqn, I've tested it in the MathML
and image math modes and it failed with fatal error.
I now make heavy use of breqn package since many of the
equations generated from computer algebra systems are long
and breqn package is the only way to break them without manual
editing which is not possible since these equations are
auto generated each time my program runs.
breqn is only needed
