Doesn't work in IE – which means it is unusable.

Uhm..World’s most used browser? Ye maybe 20 years ago.
Check here https://www.w3schools.com/browsers/browsers_stats.asp

In my opinion using IE is an irresponsible action.

Ha, yeah, I guess I haven’t been following the stats too closely for the past decade. I’m not a huge fan of Microsoft in either, so its okay with me. Still, I can’t have 10% of visitors going 404.