Following web standards, the modern _evergreen_ browsers are all
supported. This applies equally to mobile platforms. Assuming current
trends continue, this should be a sustainable policy.
Microsoft deprecated all versions of Internet Explorer. IE 11, the last
version, is described as a "compatibility solution" rather than a web
browser. Whilst it will receive security updates for the lifetime of
Windows 10 it's use is actively discouraged.
The IE 11 downloads page makes it clear: "We recommend you use the new
Microsoft Edge".
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