formr.org
                                
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                        reevaluate use of webshim
No longer maintained, maybe most features we use are now in major browsers?
Recent thoughts in the development team about the usage of webshim (extract of the email correspondence):
Yes, we still need a polyfill, e. g. for date input: https://caniuse.com/#search=date
Apple and Mozilla aren't properly supporting date-input-fields. As for Firefox, I have experienced that myself. Sometimes I have to switch to Chrome just because a date picker doesn't work properly.
And: The advantage of formr being webbased is, that we support basically any platform that has a browser with JavaScript. We shouldn't give that up in my opinion. Having a software, that depends on being online and only works with a-graded browsers is far less attractive than supporting basically any browser. (I personally use Bubble on my phone for example, which sometimes lacks basic features, but has a super fantastic background loading feature which is awesome when you have a shitty or throttled internet connection.) I think plurality in the browser market is a good thing, so we should support that and don't reduce the application to a-graded browsers with big developing teams.
Webshim is out of development, but still gets security updates.
Possible alternative: Modernizr (https://modernizr.com/).
modernizr just does detection AFAIK, so where to get a library of shims from? webshims hasn't been updated in 4 years...