Firefox OS Building Blocks Input Reset JS

ffos_input-reset.js

// helper for iterating NodeList of element objects
var forEach = Array.prototype.forEach;

forEach.call(
	document.querySelectorAll('form p input + button[type="reset"], form p textarea + button[type="reset"]'), 
	function( el ) {
	el.addEventListener ('mousedown', function () {
		var field = document.querySelector('input:focus , textarea:focus');
		field.value = field.defaultValue;
	});
});