[tty2300]

You can't exactly expect websites to work in an ancient compatibility tool.

[yoz-y]

To be frank, IE11 has regular updates and everything. It's not that compatible with old stuff either.

[tty2300]

IE is many many years behind other browsers. I have to support it at work and many many hours are spent reimplementing things that exist in modern browsers because IE doesn't support it.

[Crinus]

The behavior on the site is just an on-click handler, it should be possible to get the exact same behavior on IE6 without even trying much, let alone IE11.

Web devs seem to just use stuff for the sake of using them, not because they actually need them.

[tty2300]

Most likely they just read the docs and used the first feature that did the job and never bothered to test in IE because its a waste of time.