I hope this answer may be of some help to anyone who comes across this discussion.
I was hoping to get some help here but instead got trolls who offered the following advice:
"Sorry, this is not a place to get your html/css/javascript/... code working in Safari.
Engage a professional or use a better tool.
See here: https://www.wix.com"
"Sorry but your code did not work.
There are millions of complicated websites running on iOS without issues (banks, restaurants, flight, tickets, etc...)
You need to use a Mac to develop/test your website."
"As said you'll need a Mac.
See here: https://developer.apple.com/safari/"
"If you want to develop for iOS you need a Mac and Xcode. Not Google Dev, not Chrome, not Mozilla, not Windows, not anything else and certainly not an iPhone 5SE."
"So no thanks to me?
With that attitude, you won't go far."
The solution was quite simple, and did not require a Mac, or any special tools, that is other than Google and Patience...
Here is a link to see the full solution:
https://stackoverflow.com/questions/54236221/responsive-hamburger-menu-not-working-on-mobile-safari/54290816#54290816
And just for the trolls, this next link would have been helpful if I did not find it so dated:
https://developer.apple.com/library/archive/documentation/AppleApplications/Reference/SafariWebContent/HandlingEvents/HandlingEvents.html
For everyone else who may find this question, I hope the answer is useful to you, and that you have a better experience asking the developer community for help ;-)