diff --git a/src/BaseHtml.php b/src/BaseHtml.php
index 1baf6df..2081786 100644
--- a/src/BaseHtml.php
+++ b/src/BaseHtml.php
@@ -28,14 +28,10 @@ abstract class BaseHtml extends \yii\helpers\Html
      */
     public static $autoIdPrefix = 'i';
     /**
-     * @var bool whether to removes duplicate class names in tag attribute `class` (fix strange yii2 behavior since 2.0.44)
-     * @see mergeCssClasses()
-     * @see renderTagAttributes()
-     * @since 2.0.3
+     * @inheritDoc
      */
     public static $normalizeClassAttribute = true;
 
-
     /**
      * Renders Bootstrap static form control.
      *
@@ -56,6 +52,7 @@ abstract class BaseHtml extends \yii\helpers\Html
 
     /**
      * Generates a Bootstrap static form control for the given model attribute.
+     *
      * @param Model $model the model object.
      * @param string $attribute the attribute name or expression. See [[getAttributeName()]] for the format
      * about attribute expression.
@@ -76,24 +73,33 @@ abstract class BaseHtml extends \yii\helpers\Html
     }
 
     /**
-     * {@inheritDoc}
+     * {@inheritdoc}
+     * Pass `true` in `$options['inline']` to generate {@see https://getbootstrap.com/docs/5.1/forms/checks-radios/#inline inline list}.
      */
     public static function radioList($name, $selection = null, $items = [], $options = []): string
     {
+        $inline = ArrayHelper::remove($options, 'inline', false);
+
         if (!isset($options['item'])) {
             $itemOptions = ArrayHelper::remove($options, 'itemOptions', []);
-            $encode = ArrayHelper::getValue($options, 'encode', true);
-            $options['item'] = function ($index, $label, $name, $checked, $value) use ($itemOptions, $encode) {
-                unset($index);
-                $options = array_merge(
-                    [
-                        'class' => 'form-check-input',
-                        'label' => $encode ? static::encode($label) : $label,
-                        'labelOptions' => ['class' => 'form-check-label'],
-                        'value' => $value,
-                    ], $itemOptions);
+            static::addCssClass($itemOptions, ['bootstrap' => 'form-check-input']);
+            if (!isset($itemOptions['labelOptions'])) {
+                $itemOptions['labelOptions'] = ['class' => 'form-check-label'];
+            } else {
+                static::addCssClass($itemOptions['labelOptions'], ['bootstrap' => 'form-check-label']);
+            }
 
-                return '<div class="form-check">' . static::radio($name, $checked, $options) . '</div>';
+            $wrapperOptions = $inline ? ['class' => 'form-check form-check-inline'] : ['class' => 'form-check'];
+
+            $encode = ArrayHelper::getValue($options, 'encode', true);
+
+            $options['item'] = function ($index, $label, $name, $checked, $value) use ($itemOptions, $wrapperOptions, $encode) {
+                $itemOptions['value'] = $value;
+                if (!isset($itemOptions['label'])) {
+                    $itemOptions['label'] = $encode ? static::encode($label) : $label;
+                }
+
+                return static::tag('div', static::radio($name, $checked, $itemOptions), $wrapperOptions);
             };
         }
 
@@ -102,23 +108,32 @@ abstract class BaseHtml extends \yii\helpers\Html
 
     /**
      * {@inheritdoc}
+     * Pass `true` in `$options['inline']` to generate {@see https://getbootstrap.com/docs/5.1/forms/checks-radios/#inline inline list}.
      */
     public static function checkboxList($name, $selection = null, $items = [], $options = []): string
     {
+        $inline = ArrayHelper::remove($options, 'inline', false);
+
         if (!isset($options['item'])) {
             $itemOptions = ArrayHelper::remove($options, 'itemOptions', []);
-            $encode = ArrayHelper::getValue($options, 'encode', true);
-            $options['item'] = function ($index, $label, $name, $checked, $value) use ($itemOptions, $encode) {
-                unset($index);
-                $options = array_merge(
-                    [
-                        'class' => 'form-check-input',
-                        'label' => $encode ? static::encode($label) : $label,
-                        'labelOptions' => ['class' => 'form-check-label'],
-                        'value' => $value,
-                    ], $itemOptions);
+            static::addCssClass($itemOptions, 'form-check-input');
+            if (!isset($itemOptions['labelOptions'])) {
+                $itemOptions['labelOptions'] = ['class' => 'form-check-label'];
+            } else {
+                static::addCssClass($itemOptions['labelOptions'], 'form-check-label');
+            }
 
-                return '<div class="form-check">' . Html::checkbox($name, $checked, $options) . '</div>';
+            $wrapperOptions = $inline ? ['class' => 'form-check form-check-inline'] : ['class' => 'form-check'];
+
+            $encode = ArrayHelper::getValue($options, 'encode', true);
+
+            $options['item'] = function ($index, $label, $name, $checked, $value) use ($itemOptions, $wrapperOptions, $encode) {
+                $itemOptions['value'] = $value;
+                if (!isset($itemOptions['label'])) {
+                    $itemOptions['label'] = $encode ? static::encode($label) : $label;
+                }
+
+                return static::tag('div', static::checkbox($name, $checked, $itemOptions), $wrapperOptions);
             };
         }
 
@@ -130,15 +145,13 @@ abstract class BaseHtml extends \yii\helpers\Html
      */
     public static function error($model, $attribute, $options = []): string
     {
-        if (!array_key_exists('class', $options)) {
-            $options['class'] = ['invalid-feedback'];
-        }
+        static::addCssClass($options, 'invalid-feedback');
 
         return parent::error($model, $attribute, $options);
     }
 
     /**
-     * @inheritdoc
+     * {@inheritdoc}
      */
     protected static function booleanInput($type, $name, $checked = false, $options = []): string
     {