HTML5 script async

The HTML5 “async” attribute simplifies page-load performance improvements and dynamic script loading, it can be useful in modern web browsers.

Simply put, this tag allows for the browser to asynchronously load and execute external javascript files in a parallel vs. serial manner. Unfortunately while most modern browser support it, MSIE versions prior to MSIE10+ are problematic.


<script src="example.js" async="async"></script>

This is particularly useful when using third-party javascript libraries and utilities that have no dependeny relationships with your existing website javascript.

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