diff --git a/framework/CHANGELOG.md b/framework/CHANGELOG.md
index 8f2209d17ff..594c69c1c12 100644
--- a/framework/CHANGELOG.md
+++ b/framework/CHANGELOG.md
@@ -228,6 +228,7 @@ Yii Framework 2 Change Log
 - Bug #18993: Load defaults by `attributes()` in `yii\db\ActiveRecord::loadDefaultValues()` (WinterSilence)
 - Bug #19021: Fix return type in PhpDoc `yii\db\Migration` functions `up()`, `down()`, `safeUp()` and `safeDown()` (WinterSilence, rhertogh)
 - Bug #19030: Add DI container usage to `yii\base\Widget::end()` (papppeter)
+- Enh #19100: Add methods `isCustomTagAttribute`, `normalizeTagAttributes` and `mergeTagAttributes` in `yii\helper\BaseHtml` (WinterSilence)
 - Bug #19031: Fix displaying console help for parameters with declared types (WinterSilence)
 - Bug #19096: Fix `Request::getIsConsoleRequest()` may return erroneously when testing a Web application in Codeception (WinterSilence)
 - Enh #13105: Add yiiActiveForm `validate_only` property for skipping form auto-submission (ptolomaues)
diff --git a/framework/helpers/BaseHtml.php b/framework/helpers/BaseHtml.php
index ff81df22752..d0f4d0bd6c4 100644
--- a/framework/helpers/BaseHtml.php
+++ b/framework/helpers/BaseHtml.php
@@ -2242,6 +2242,100 @@ public static function cssStyleToArray($style)
         return $result;
     }
 
+    /**
+     * Checks if is custom attribute of tag by prefix [[$dataAttributes]].
+     *
+     * @param string $name the attribute name
+     * @param string|null $prefix the attribute prefix returns by reference
+     * @return bool
+     * @since 2.0.44
+     */
+    public static function isCustomTagAttribute($name, &$prefix = null)
+    {
+        foreach (static::$dataAttributes as $prefix) {
+            if (StringHelper::startsWith($name, $prefix . '-')) {
+                return true;
+            }
+        }
+        $prefix = null;
+
+        return false;
+    }
+
+    /**
+     * Normalizes an array of tag attributes.
+     *
+     * ```php
+     * $attributes = Html::normalizeAttributes(['data-id' => 1, 'style' => 'height: 1px', 'class' => 'foo bar']);
+     * // $attributes: ['data' => ['id' => 1], 'style' => ['height' => '1px'], 'class' => ['foo', 'bar']]
+     * ```
+     *
+     * @param array $attributes the attributes to normalize
+     * @return array
+     * @since 2.0.44
+     */
+    public static function normalizeTagAttributes(array $attributes)
+    {
+        $result = [];
+
+        if (isset($attributes['style'])) {
+            if (is_string($attributes['style'])) {
+                $attributes['style'] = static::cssStyleToArray($attributes['style']);
+            }
+            $result['style'] = $attributes['style'];
+            unset($attributes['style']);
+        }
+        if (isset($attributes['class'])) {
+            if (is_string($attributes['class'])) {
+                $attributes['class'] = explode(' ', $attributes['class']);
+            }
+            $result['class'] = array_unique($attributes['class']);
+            unset($attributes['class']);
+        }
+        foreach ($attributes as $name => $value) {
+            if (is_array($value) && in_array($name, static::$dataAttributes, true)) {
+                $result[$name] = isset($result[$name]) ? array_merge($result[$name], $value) : $value;
+            } elseif (static::isCustomTagAttribute($name, $prefix)) {
+                if (!isset($result[$prefix])) {
+                    $result[$prefix] = [];
+                }
+                list(, $name) = explode($prefix . '-', $name, 2);
+                $result[$prefix][$name] = $value;
+            } else {
+                $result[$name] = $value;
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * Normalizes and merges two arrays of tag attributes.
+     *
+     * @param array $attributes The input attributes
+     * @param array $attributes2 The attributes to merge
+     * @return array
+     * @since 2.0.44
+     */
+    public static function mergeTagAttributes(array $attributes, array $attributes2)
+    {
+        $attributes = static::normalizeTagAttributes($attributes);
+        $attributes2 = static::normalizeTagAttributes($attributes2);
+        if (isset($attributes2['class'])) {
+            static::addCssClass($attributes, $attributes2['class']);
+            unset($attributes2['class']);
+        }
+        foreach ($attributes2 as $key => $value) {
+            if (in_array($key, static::$dataAttributes, true) || $key === 'style') {
+                $attributes[$key] = isset($attributes[$key]) ? array_merge($attributes[$key], $value) : $value;
+            } else {
+                $attributes[$key] = $value;
+            }
+        }
+
+        return $attributes;
+    }
+
     /**
      * Returns the real attribute name from the given attribute expression.
      *
diff --git a/tests/framework/helpers/HtmlTest.php b/tests/framework/helpers/HtmlTest.php
index 24c8186181b..43bd6f33edd 100644
--- a/tests/framework/helpers/HtmlTest.php
+++ b/tests/framework/helpers/HtmlTest.php
@@ -1411,6 +1411,126 @@ public function testRemoveCssStyle()
         $this->assertEquals('width: 100px;', $options['style']);
     }
 
+    /**
+     * @return array[]
+     */
+    public function dataProviderIsCustomTagAttribute()
+    {
+        return [
+            'valid "aria" prefix' => ['aria-expanded', true],
+            'valid "data" prefix' => ['data-bs-target', true],
+            'valid "data-ng" prefix' => ['data-ng-id', true],
+            'underscore suffix' => ['data-foo_bar', true],
+            'name in camelCase' => ['dataId', false],
+            'only "aria" prefix' => ['aria', false],
+            'invalid "js" prefix' => ['js-action', false],
+        ];
+    }
+
+    /**
+     * @param string $name the attribute name
+     * @param bool $expected the expected result
+     * @dataProvider dataProviderIsCustomTagAttribute
+     */
+    public function testIsCustomTagAttribute($name, $expected)
+    {
+        $this->assertEquals($expected, Html::isCustomTagAttribute($name));
+    }
+
+    /**
+     * @return array[]
+     */
+    public function dataProviderNormalizeTagAttributes()
+    {
+        return [
+            'mixed "data"' => [
+                [
+                    'data-id' => 2,
+                    'data' => ['foo-bar' => 'baz'],
+                ],
+                [
+                    'data' => ['id' => 2, 'foo-bar' => 'baz'],
+                ],
+            ],
+            'inline "style"' => [
+                [
+                    'style' => 'height:1px;width:100px',
+                ],
+                [
+                    'style' => ['height' => '1px', 'width' => '100px'],
+                ],
+            ],
+            'inline "class"' => [
+                [
+                    'class' => 'form-control form-control-sm',
+                ],
+                [
+                    'class' => ['form-control', 'form-control-sm'],
+                ],
+            ],
+            'duplicate "class"' => [
+                [
+                    'class' => 'form-control form-control',
+                ],
+                [
+                    'class' => ['form-control'],
+                ],
+            ],
+            'all cases' => [
+                [
+                    'data-id' => 123,
+                    'data-bs-target' => '#input-name',
+                    'aria-hidden' => 'true',
+                    'style' => 'display: none;',
+                    'class' => 'navbar navbar-dark',
+                    'method' => 'POST',
+                    'id' => 'main-form',
+                ],
+                [
+                    'data' => ['id' => 123, 'bs-target' => '#input-name'],
+                    'aria' => ['hidden' => 'true'],
+                    'style' => ['display' => 'none'],
+                    'class' => ['navbar', 'navbar-dark'],
+                    'method' => 'POST',
+                    'id' => 'main-form'
+                ],
+            ],
+        ];
+    }
+
+    /**
+     * @param array $attributes the attributes to normalize
+     * @param array $expected the normalized attributes
+     * @dataProvider dataProviderNormalizeTagAttributes
+     */
+    public function testNormalizeTagAttributes(array $attributes, array $expected)
+    {
+        $this->assertEquals($expected, Html::normalizeTagAttributes($attributes));
+    }
+
+    public function testMergeTagAttributes()
+    {
+        $attributes = [
+            'data-id' => 1,
+            'data-bs-target' => '#input-name',
+            'style' => 'display: none;',
+            'class' => ['widget' => 'navbar navbar-dark'],
+            'id' => 'form-1',
+        ];
+        $attributes2 = [
+            'data' => ['id' => 2, 'foo' => 'bar'],
+            'class' => 'bg-primary',
+            'id' => 'form-2',
+        ];
+        $expected = [
+            'data' => ['id' => 2, 'bs-target' => '#input-name', 'foo' => 'bar'],
+            'style' => ['display' => 'none'],
+            'class' => ['widget' => 'navbar navbar-dark', 'bg-primary'],
+            'id' => 'form-2',
+        ];
+        $this->assertEquals($expected, Html::mergeTagAttributes($attributes, $attributes2));
+    }
+
     public function testBooleanAttributes()
     {
         $this->assertEquals('<input type="email" name="mail">', Html::input('email', 'mail', null, ['required' => false]));