modernizr/feature-detects/script/defer.js

Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser.

/*!
{
  "name": "script[defer]",
  "property": "scriptdefer",
  "caniuse": "script-defer",
  "tags": ["script"],
  "authors": ["Theodoor van Donge"],
  "warnings": ["Browser implementation of the `defer` attribute vary: http://stackoverflow.com/questions/3952009/defer-attribute-chrome#answer-3982619"]
}
!*/
/* DOC

Detects support for the `defer` attribute on the `<script>` element.

*/
define(['Modernizr', 'createElement'], function( Modernizr, createElement ) {
  Modernizr.addTest('scriptdefer', 'defer' in createElement('script'));
});