Using features

requiring_features.js

define(['feature!async-promise'],function(embed){
    // Now you have embed.Promise available!
})

// All features return the same object, so that you
// can do the following:

define(['feature!async-promise', 'feature!html-element'], function(embed){
    // All methods provided by the html-element feature are now
    // available in the object returned by the async-promise feature,
    // too
});