title: prop() and attr() not working in IE11
body: <p><a href="https://i.stack.imgur.com/YwYln.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/YwYln.jpg" alt="enter image description here"></a></p>
  
  <p>[developed by someone else] Working on a bug. Initially, the month picker input field will be disabled until you enter a value on the left side input. It works in Chrome and other browsers, but not in IE11.</p>
  
  <pre><code>&lt;div class="col-xs-12 col-sm-2 col-md-2"&gt;
      &lt;h5 class="control-label subaccount-view" data-bind="text: ProfileViewModel.userProfile().GATarget"&gt;&lt;/h5&gt;
      &lt;input type="text" id="txtGATarget" class="subaccount-edit txt-gatarget txt-contolrs cls-validate-txt" style="display:none"&gt;
      &lt;span class="text-danger" id="gaTargetVal" style="display:none"&gt;@T("subaccount-emptygatarget")&lt;/span&gt;
  &lt;/div&gt;
  &lt;div class="col-xs-12 col-sm-3 col-md-2 cls-addinfo-history"&gt;
      &lt;div class="input-dp-wrap"&gt;
      &lt;input type="text" class="month_year" id="effectiveDateFrom_GA" disabled="disabled" /&gt;
      &lt;span class="text-danger" id="ga_DateVal" style="display:none"&gt;@T("subaccount-month-invalidselect")&lt;/span&gt;
      &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>JS -</p>
  
  <pre><code>$('.txt-gatarget').change(function () {
      var gatarget = $(this).val();
      $('#gaTargetVal').css("display", "none");
      if (gatarget == "") {
          var errMsg = @Html.Raw(Json.Encode(T("subaccount-emptygatarget")));
          $('#gaTargetVal').html(errMsg.Text) ;
          $('#gaTargetVal').css("display", "block");
          $('#submitAdditionalInfo').attr('disabled', true);
          $('.btn-saveedit').attr('disabled', true);
      }
      else if(gatarget.indexOf(".") &gt;= 0)
      {
          var errMsg = @Html.Raw(Json.Encode(T("subaccount-invalidgatarget")));
          $('#gaTargetVal').html(errMsg.Text) ;
          $('#gaTargetVal').css("display", "block");
          $('#submitAdditionalInfo').attr('disabled', true);
          $('.btn-saveedit').attr('disabled', true);
      }
      else {
          var isAllowed = EnableButton();
          if(!isAllowed)
          {
              $('#submitAdditionalInfo').attr('disabled', true);
              $('.btn-saveedit').attr('disabled', true);
          }
          $('#effectiveDateFrom_GA').prop('disabled', false)  ;
      }
  });
  </code></pre>
  
  <p>The version of jQuery being used is 1.11.0 if you ask.</p>