Polymer's polyfill for lacking support for arrays in form.elements. It really sucks.

polyfill

//it's one of the ugliest hacks I've ever created…
for(var x in this.$)
{
	if(!this.$.hasOwnProperty(x) ||x.indexOf('chars') !== 0)
		continue;

	var tmp = this.$[x];

	if(tmp.checked)
		range += chars[tmp.value];
}