Welcome to the forum.
I don't know the cause of the problem or the solution but I was doing some unconnected work and noticed RH created this tag
Unfortunately, this doesn't work either. I also tried <body lang=eng>. Any other ideas?
I used the aXe Chrome extension (Easy Accessibility Testing with aXe ) to check WCAG accessibility of the help pages, and it's looking for this on every page:
I tried adding that to a master page, but it's not there when generated. Just <html>. It doesn't even have the default on the generated pages: <html xmlns="http://www.w3.org/1999/xhtml">
I assume there is something in one of the files in:
C:\Program Files (x86)\Adobe\Adobe RoboHelp 2017\RoboHTML\WebHelp5Ext\template_stock\whxdata
that would change that, but I haven't found it yet.
If someone figures it out, please post it here!