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Browser support
Important Starting with BSN v4.2, we discontinued our Bootstrap V4 version with its polyfills and all, to focus more on the upcoming Bootstrap 5.2+ versions.
Starting with BSN v4.1, the V4 and V5 packages use different utilities and functionality, especially around browser detection and fallback, which means the V5 no longer supports IE as well as early versions of Microsoft Edge.
The BSN components are tested to work nearly perfect in all major browsers, including semi-legacy browsers starting with IE10. On the other hand BSN V4 supports IE10+ and there is a set of browsers that still require help.
In order to make legacy browsers comply with today's HTML5 standards, make sure you include a polyfill that covers most essential JavaScript API.
The Native JavaScript for Bootstrap comes with a dedicated 2Kb polyfill called polyfill.js, designed for IE10+ and is recommended to be used.
For broader projects, a viable solution could be the minifill.js, which is mostly same as the provided polyfill but covering a wider range of features.
Finally an all-round polyfill solution is the Financial Times service:
<script src="https://cdn.polyfill.io/v2/polyfill.min.js"></script>Remember that the polyfill link(s) must be in your <head>, or at least before your other scripts.
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