Datalist browser support (Dec 2011) is Firefox 4+, Opera 10.6+, and IE 10. It's reasonable that you'd want WebKit support. So. This.
load-fallbacks.js calls the plugin. Example contents:
$('#search').relevantDropdown();$('#name').relevantDropdown({ fadeOutSpeed: 0, // optional, default: 'normal; change: function(new_text) { console.log('the new value is: ', new_text); } });