As of Aug 18 2021, Internet Explorer is not supported by Microsoft 365 apps and services, Microsoft Dynamics 365, and Microsoft Power Platform. So, even if, somehow, it’s still there due to the corporate polices, it’s probably the last time I see a web page in the Internet Explorer:
https://docs.microsoft.com/en-ca/lifecycle/announcements/internet-explorer-11-support-end-dates
From here on, there is just no reason to have it.
PS. So, for example, I can safely use classes in my javascript web resources (I guess among other things), since, even though Internet Explorer would not support those, it does not matter anymore.