[tex4ht] add package animate makes some math disappear from web page

[Nasser M. Abbasi]

I found another strange problem with tex4ht.

When I include \usepackage{animate}, some math do not show up
in the web page. Empty space shows up! The svg file is bad.

Here is a MWE that shows the problem.

------------------------------------------
\documentclass[11pt]{article}%
\usepackage[T1]{fontenc}
\usepackage{amsmath,mathtools}
\usepackage{animate} %This package makes math go away!

\begin{document}
This is a test
\begin{align*}
r_p   &= r_{earth} + \text{alt}
\end{align*}
\end{document}
----------------------------

Compiled with

make4ht   -u  -c ./nma.cfg -e ./main.mk4 foo.tex

Also same problem if I add "--lua" option above. No difference.

THe problem is that the svg image created for the equation does not look
right. Here it is:

--------------------------------------
<?xml version='1.0'?>
<!-- This file was generated by dvisvgm 1.9.2 -->
<svg version='1.1' xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink'>
<g id='page1' transform='matrix(1.15 0 0 1.15 0 0)'/>
</svg>
------------------------

If I remove the animate package and recompile, now the equation shows up
just fine and the svg image file is correct and has much more information
in it than the above. A correct svg file. Here is part of it

--------------------
<?xml version='1.0'?>
<!-- This file was generated by dvisvgm 1.9.2 -->
<svg height='12.2654pt' version='1.1' viewBox='181.969 129.793 87.3202 12.2654' width='87.3202pt' xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink'>
<defs>
<path d=
....
----------------------------

Why is including animate package causes this math problem?

I am pasting below both nma.cfg and main.mk4 so this email
will contain everything to reproduce this problem. I hope someone
can reproduce it. This shows on firefox and chrome. Using TL 2015
on Linux mint.

--- nma.cfg---
\Preamble{ext=htm,charset="utf-8",p-width,pic-align}

\begin{document}
\DeclareGraphicsExtensions{.svg,.png}
\Configure{Picture}{.svg}
\makeatletter
\newcommand\emwidth{10}
\newcommand\CalcRem[1]{\strip at pt\dimexpr(#1)/\emwidth}
\Configure{graphics*}
            {svg}
             {\Picture[pict]{\csname Gin at base\endcsname.svg
             \space style="width:\CalcRem{\Gin at req@width}em;"
             }%
             \special{t4ht+ at File: \csname Gin at base\endcsname.svg}
            }
\makeatother
\EndPreamble
--------------------------

--- main.mk4---
Make:add("dvisvgm","dvisvgm -v1 -n -c 1.15,1.15 -p 1- ${input}.idv")
Make:htlatex {packages = "\\RequirePackage[dvipdfmx]{graphicx}"}
local max_count = 5


local image_pattern

local function file_exists(fn)
   local f = io.open(fn,"r")
   if f ==  nil then return false else f:close() return true end
end

local function search_file(input, ext, count)
   local pattern = count > 0 and "%s-%0"..count.."i." or "%s."
   pattern = pattern .. ext
   local filename = string.format(pattern, input, 1)
   if file_exists(filename) then
     return pattern
   elseif count < 0 then return nil
   else
     return search_file(input, ext, count - 1)
   end
end

local img_count = 0
local function locate_file(par,ext)
   if  image_pattern then
     img_count = img_count + 1
     return string.format(image_pattern, par.input,  img_count)
   else
     image_pattern =  search_file(par.input, ext, max_count)
     if not image_pattern then
       print("Cannot locate output svg pattern")
       return nil
     end
     return locate_file(par, ext)
   end
end


Make:htlatex{}
Make:htlatex{}
Make:htlatex{}
Make:tex4ht{}
Make:t4ht{}

Make:dvisvgm{}
Make:image("svg$",function(arg)
   arg.input = arg.source:gsub(".idv$","")
   local fn,msg = locate_file(arg, "svg")
   if not fn then
     print("Image processing error: "..msg)
   else
     arg.filename = fn
     local cmd = "mv ${filename} ${output}" % arg
     print(cmd)
     os.execute(cmd)
   end
end
)
---------

Too many package conflicts. Too little time.

--Nasser