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Asynchronous and deferred JavaScript execution explained
  • Normal execution <script>
    This is the default behavior of the <script> element. Parsing of the HTML code pauses while the script is executing. For slow servers and heavy scripts this means that displaying the webpage will be delayed.
  • Deferred execution <script defer>
    Simply put: delaying script execution until the HTML parser has finished. A positive effect of this attribute is that the DOM will be available for your script. However, since not every browser supports defer yet, don’t rely on it!
  • Asynchronous execution <script async>
    Don’t care when the script will be available? Asynchronous is the best of both worlds: HTML parsing may continue and the script will be executed as soon as it’s ready. I’d recommend this for scripts such as Google Analytics.

Reference : http://peter.sh/experiments/asynchronous-and-deferred-javascript-execution-explained/

Reference : http://www.html5rocks.com/en/tutorials/speed/script-loading/