I use lyx for writing webpages with math.
I have \usepackage{html} in the preamble,
and some documents starts with the following code
\begin{rawhtml}
<?php include("../../lek_header.php") ?>
\end{rawhtml}
1.2.0pre3 makes 3 ERT insets, which is fine - but
also insists that the first of these inset is in the
english language. I don't think that makes a difference,
but it is certainly odd. The whole document used
to be in norwegian. (\language norsk)
The lyx file now have
\lang english
before the first inset, and it appears with a blue underline
on screen. There is no trace of english in the pre-1.2.0pre3 file.
Also, latex2html is much better at creating text math (instead of
images) from the latex output by 1.1.6fix4 than the
math output by 1.2.0pre3. I guess that is a latex2html problem though.
Text math generally looks better than images.
Helge Hafting