Bootstrap 4 drops support for Internet Explorer 8 and 9. Worldwide usage stats of both browsers are miniscule now (IE8 is at 0.27% and IE9 at 0.16% based on StatCounter GlobalStats for December, 2017), but still there maybe times when you need to support these older browsers.
I’ve created a CSS-only polyfill solution which can be loaded via conditional statements as follows:
IE9 Visitors will then get a
bootstrap-ie9.css stylesheet loading which provides a float-based layout fallback since IE9 doesn’t support Flexbox. In addition the HTML5Shiv polyfill is loaded via a CDN.
IE8 visitors will get (in addition to the above) a
bootstrap-ie8.css stylesheet which fixes many compatibility issues.
More info on GitHub
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