Web export of math displays rubbish in all non-firefox browsers I tried

As stated. e.g. export to web of the attached document to "complete zip file" opened in opera, internet explorer, vivaldi all were useless. I also attached the exported zip file.

I want to use this to put math online. But I can't. Still waiting on this. I complained much earlier and received no useful response. What is going on?

first.sci87.77 KB
firstweb.zip16.42 KB