Hi Nasser,
> I've just finished testing the above filter on a 17,000 pages > document which took 6 hrs to compile to HTML. > That is still quite long! But it is great that it converts correctly. > The automatic conversion from dmath and dgroup to align enviroment > looks to be working very well and equation numbers are showing up correctly. > > I want to thank Michal again for all his help and support. Now there > is no need for me to duplicate code for tex4ht vs. pdf in same Latex > document. I can just use breqn for both environment. > I am glad that I could help. > If others want to use this setup, I added a small diagram > to my tex4ht cheat sheet showing the configuration > > https://www.12000.org/my_notes/faq/LATEX/htch4.htm#x5-690004.2 > > The lua filter from the above link is called config.lua in the > diagram, and it has to go to that specific folder as shown. > The .config/make4ht/config.lua is used by default, you don't need to load it explicitly with the "-e" option. You can use the "-e" option for project-specific build files. Best regards, Michal