diff --git a/framework/CHANGELOG.md b/framework/CHANGELOG.md
index 579411a09a..87ad7609a0 100644
--- a/framework/CHANGELOG.md
+++ b/framework/CHANGELOG.md
@@ -4,6 +4,7 @@ Yii Framework 2 Change Log
 2.0.37 under development
 ------------------------
 
+- Bug #17147: Fix form attribute validations for empty select inputs (kartik-v)
 - Bug #18171: Change case of column names in SQL query for `findConstraints` to fix MySQL 8 compatibility (darkdef)
 - Bug #18170: Fix 2.0.36 regression in passing extra console command arguments to the action (darkdef)
 - Bug #18182: `yii\db\Expression` was not supported as condition in `ActiveRecord::findOne()` and `ActiveRecord::findAll()` (rhertogh)
diff --git a/framework/assets/yii.activeForm.js b/framework/assets/yii.activeForm.js
index 6c3a79a7c7..0c1ccb0f77 100644
--- a/framework/assets/yii.activeForm.js
+++ b/framework/assets/yii.activeForm.js
@@ -14,11 +14,13 @@
     $.fn.yiiActiveForm = function (method) {
         if (methods[method]) {
             return methods[method].apply(this, Array.prototype.slice.call(arguments, 1));
-        } else if (typeof method === 'object' || !method) {
-            return methods.init.apply(this, arguments);
         } else {
-            $.error('Method ' + method + ' does not exist on jQuery.yiiActiveForm');
-            return false;
+            if (typeof method === 'object' || !method) {
+                return methods.init.apply(this, arguments);
+            } else {
+                $.error('Method ' + method + ' does not exist on jQuery.yiiActiveForm');
+                return false;
+            }
         }
     };
 
@@ -178,14 +180,14 @@
 
     var submitDefer;
 
-    var setSubmitFinalizeDefer = function($form) {
+    var setSubmitFinalizeDefer = function ($form) {
         submitDefer = $.Deferred();
         $form.data('yiiSubmitFinalizePromise', submitDefer.promise());
     };
 
     // finalize yii.js $form.submit
-    var submitFinalize = function($form) {
-        if(submitDefer) {
+    var submitFinalize = function ($form) {
+        if (submitDefer) {
             submitDefer.resolve();
             submitDefer = undefined;
             $form.removeData('yiiSubmitFinalizePromise');
@@ -327,15 +329,22 @@
                 this.$form = $form;
                 var $input = findInput($form, this);
 
-                if ($input.is(":disabled")) {
+                if ($input.is(':disabled')) {
                     return true;
                 }
-                // pass SELECT without options
+                // validate markup for select input
                 if ($input.length && $input[0].tagName.toLowerCase() === 'select') {
-                    if (!$input[0].options.length) {
-                        return true;
-                    } else if (($input[0].options.length === 1) && ($input[0].options[0].value === '')) {
-                        return true;
+                    var opts = $input[0].options, isEmpty = !opts || !opts.length, isRequired = $input.attr('required'),
+                        isMultiple = $input.attr('multiple'), size = $input.attr('size') || 1;
+                    // check if valid HTML markup for select input, else return validation as `true`
+                    // https://w3c.github.io/html-reference/select.html
+                    if (isRequired && !isMultiple && parseInt(size, 10) === 1) { // invalid select markup condition
+                        if (isEmpty) { // empty option elements for the select
+                            return true;
+                        }
+                        if (opts[0] && (opts[0].value !== '' && opts[0].text !== '')) { // first option is not empty
+                            return true;
+                        }
                     }
                 }
                 this.cancelled = false;
@@ -363,7 +372,7 @@
             });
 
             // ajax validation
-            $.when.apply(this, deferreds).always(function() {
+            $.when.apply(this, deferreds).always(function () {
                 // Remove empty message arrays
                 for (var i in messages) {
                     if (0 === messages[i].length) {
@@ -404,13 +413,15 @@
                             submitFinalize($form);
                         }
                     });
-                } else if (data.submitting) {
-                    // delay callback so that the form can be submitted without problem
-                    window.setTimeout(function () {
-                        updateInputs($form, messages, submitting);
-                    }, 200);
                 } else {
-                    updateInputs($form, messages, submitting);
+                    if (data.submitting) {
+                        // delay callback so that the form can be submitted without problem
+                        window.setTimeout(function () {
+                            updateInputs($form, messages, submitting);
+                        }, 200);
+                    } else {
+                        updateInputs($form, messages, submitting);
+                    }
                 }
             });
         },
@@ -459,9 +470,9 @@
                         $errorElement = data.settings.validationStateOn === 'input' ? $input : $container;
 
                     $errorElement.removeClass(
-                      data.settings.validatingCssClass + ' ' +
-                      data.settings.errorCssClass + ' ' +
-                      data.settings.successCssClass
+                        data.settings.validatingCssClass + ' ' +
+                        data.settings.errorCssClass + ' ' +
+                        data.settings.successCssClass
                     );
                     $container.find(this.error).html('');
                 });
@@ -492,7 +503,7 @@
          * @param id attribute ID
          * @param messages array with error messages
          */
-        updateAttribute: function(id, messages) {
+        updateAttribute: function (id, messages) {
             var attribute = methods.find.call(this, id);
             if (attribute != undefined) {
                 var msg = {};
@@ -518,7 +529,7 @@
         }
         if (attribute.validateOnType) {
             $input.on('keyup.yiiActiveForm', function (e) {
-                if ($.inArray(e.which, [16, 17, 18, 37, 38, 39, 40]) !== -1 ) {
+                if ($.inArray(e.which, [16, 17, 18, 37, 38, 39, 40]) !== -1) {
                     return;
                 }
                 if (attribute.value !== getValue($form, attribute)) {
@@ -571,7 +582,7 @@
      * @param val2
      * @returns boolean
      */
-    var isEqual = function(val1, val2) {
+    var isEqual = function (val1, val2) {
         // objects
         if (val1 instanceof Object) {
             return isObjectsEqual(val1, val2)
@@ -592,7 +603,7 @@
      * @param obj2
      * @returns boolean
      */
-    var isObjectsEqual = function(obj1, obj2) {
+    var isObjectsEqual = function (obj1, obj2) {
         if (!(obj1 instanceof Object) || !(obj2 instanceof Object)) {
             return false;
         }
@@ -621,7 +632,7 @@
      * @param arr2
      * @returns boolean
      */
-    var isArraysEqual = function(arr1, arr2) {
+    var isArraysEqual = function (arr1, arr2) {
         if (!Array.isArray(arr1) || !Array.isArray(arr2)) {
             return false;
         }
@@ -644,7 +655,7 @@
      */
     var deferredArray = function () {
         var array = [];
-        array.add = function(callback) {
+        array.add = function (callback) {
             this.push(new $.Deferred(callback));
         };
         return array;
@@ -707,10 +718,11 @@
 
         var errorAttributes = [], $input;
         $.each(data.attributes, function () {
-            var hasError = (submitting && updateInput($form, this, messages)) || (!submitting && attrHasError($form, this, messages));
+            var hasError = (submitting && updateInput($form, this, messages)) || (!submitting && attrHasError($form,
+                this, messages));
             $input = findInput($form, this);
 
-            if (!$input.is(":disabled") && !this.cancelled && hasError) {
+            if (!$input.is(':disabled') && !this.cancelled && hasError) {
                 errorAttributes.push(this);
             }
         });
@@ -721,14 +733,10 @@
             updateSummary($form, messages);
             if (errorAttributes.length) {
                 if (data.settings.scrollToError) {
-                    var top = $form.find($.map(errorAttributes, function(attribute) {
+                    var h = $(document).height(), top = $form.find($.map(errorAttributes, function (attribute) {
                         return attribute.input;
                     }).join(',')).first().closest(':visible').offset().top - data.settings.scrollToErrorOffset;
-                    if (top < 0) {
-                        top = 0;
-                    } else if (top > $(document).height()) {
-                        top = $(document).height();
-                    }
+                    top = top < 0 ? 0 : (top > h ? h : top);
                     var wtop = $(window).scrollTop();
                     if (top < wtop || top > wtop + $(window).height()) {
                         $(window).scrollTop(top);
@@ -809,11 +817,11 @@
                     $error.html(messages[attribute.id][0]);
                 }
                 $errorElement.removeClass(data.settings.validatingCssClass + ' ' + data.settings.successCssClass)
-                  .addClass(data.settings.errorCssClass);
+                    .addClass(data.settings.errorCssClass);
             } else {
                 $error.empty();
                 $errorElement.removeClass(data.settings.validatingCssClass + ' ' + data.settings.errorCssClass + ' ')
-                  .addClass(data.settings.successCssClass);
+                    .addClass(data.settings.successCssClass);
             }
             attribute.value = getValue($form, attribute);
         }
@@ -878,7 +886,7 @@
             var $realInput = $input.filter(':checked');
             if ($realInput.length > 1) {
                 var values = [];
-                $realInput.each(function(index) {
+                $realInput.each(function (index) {
                     values.push($($realInput.get(index)).val());
                 });
                 return values;
@@ -909,4 +917,4 @@
             $form.find(attribute.input).attr('aria-invalid', hasError ? 'true' : 'false');
         }
     }
-})(window.jQuery);
+})(window.jQuery);
\ No newline at end of file