Edit in JSFiddle

<form name="form1" ng-app="">
    <input type="text"
        name="account"
        ng-model="userAccount"
        ng-minlength="3"
        ng-maxlength="5"
        autocomplete="off"
        required
    /><br />
    required : {{ form1.account.$error.required }}<br />
    minlength : {{ form1.account.$error.minlength }}<br />
    maxlength : {{ form1.account.$error.maxlength }}<br />
</form>