Compatible browsers - Partial end of IE11 support

[Sami]

Internet Explorer 11, the final IE version, was released in 2013. Some of the planned changes and updates to third-party modules used by AirwaySim will not offer full IE11 support anymore, and for that reason AirwaySim will stop officially supporting this browser. Several other web services have already stopped the support for this old browser.

All of the main functions and the basic system should still work normally with IE11 but some additional visual functions might have compatibility issues in the future.

[JumboShrimp]

IE still generates highest quality image and fonts on Windows...

[LemonButt]

No frontend engineer will debate that IE is terrible, but for what it's worth you might be able to preserve some functionality with polyfills.  Polyfill.io is a free distributed hosted solution that returns polyfills based on user agent--Chrome has zero and IE11 has 4000 lines of them (about 250kb) so there is zero redundancy unnecessary prototyping.  This would patch all browsers assuming the issues are javascript-based (ES5-7/ES2015-18): https://polyfill.io/v3/polyfill.min.js?features=es2015%2Ces2016%2Ces2017%2Ces2018%2Ces5%2Ces6%2Ces7