Jquery does not allow carriage return to trigger form submission

<form class="form-inline definewidth m20" action="/" method="get">  

            <input type="text" name="title" id="title"class="abc" value="">    

            <button type="submit" class="btn" style="margin-right:20px"> The query </button>

            <select name="school_type" id="school_type">

</form>

<td style="width:90px; height:24px; text-align:center"><input   type="text" name="test" value="" class="a"></td>

The return event in the test textbox triggers the submission of the form above. This is the default behavior of the browser. To disable auto-submission, cancel the default event in the textbox.

$('.a').keypress(function(e){

            if(e.keyCode==13){

                e.preventDefault();

            }

IE10 FF29 tested is normal