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\ No newline at end of file
diff --git a/src/Tag/MathML/Mmultiscripts.php b/src/Tag/MathML/Mmultiscripts.php
new file mode 100644
index 0000000..5a64b75
--- /dev/null
+++ b/src/Tag/MathML/Mmultiscripts.php
@@ -0,0 +1,77 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yiisoft\Html\Tag\MathML;
+
+use Yiisoft\Html\Tag\Base\NormalTag;
+
+final class Mmultiscripts extends NormalTag implements MathItemInterface
+{
+    private MathItemInterface $base;
+    private Mprescripts|null $mprescripts = null;
+
+    /**
+     * @var MathItemInterface[]
+     */
+    private array $post = [];
+
+    /**
+     * @var MathItemInterface[]
+     */
+    private array $pre = [];
+
+    protected function getName(): string
+    {
+        return 'mmultiscripts';
+    }
+
+    protected function generateContent(): string
+    {
+        $content = "\n" . $this->base . "\n" . implode("\n", $this->post) . "\n";
+
+        if ($this->pre) {
+            $mprescripts = $this->mprescripts ?? Mprescripts::tag();
+            $content .= $mprescripts . "\n" . implode("\n", $this->pre) . "\n";
+        }
+
+        return $content;
+    }
+
+    public function base(MathItemInterface $base): self
+    {
+        $new = clone $this;
+        $new->base = $base;
+
+        return $new;
+    }
+
+    public function post(MathItemInterface $item, MathItemInterface ...$items): self
+    {
+        $new = clone $this;
+
+        if ($items) {
+            $new->post = [...[$item], ...$items];
+        } else {
+            $new->post = [$item];
+        }
+
+        return $new;
+    }
+
+    public function pre(MathItemInterface ...$items): self
+    {
+        $new = clone $this;
+        $new->pre = $items;
+
+        return $new;
+    }
+
+    public function mprescripts(Mprescripts|null $mprescripts): self
+    {
+        $new = clone $this;
+        $new->mprescripts = $mprescripts;
+
+        return $new;
+    }
+}
diff --git a/src/Tag/MathML/Mover.php b/src/Tag/MathML/Mover.php
new file mode 100644
index 0000000..8bb188e
--- /dev/null
+++ b/src/Tag/MathML/Mover.php
@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yiisoft\Html\Tag\MathML;
+
+/**
+ * https://developer.mozilla.org/en-US/docs/Web/MathML/Element/mover
+ */
+final class Mover extends AbstractMathItems
+{
+    public function getName(): string
+    {
+        return 'mover';
+    }
+
+    public function accent(bool $accent): self
+    {
+        $new = clone $this;
+        $new->attributes['accent'] = $accent ? 'true' : 'false';
+
+        return $new;
+    }
+}
diff --git a/src/Tag/MathML/Mprescripts.php b/src/Tag/MathML/Mprescripts.php
new file mode 100644
index 0000000..b6a4a71
--- /dev/null
+++ b/src/Tag/MathML/Mprescripts.php
@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yiisoft\Html\Tag\MathML;
+
+use Yiisoft\Html\Tag\Base\VoidTag;
+
+final class Mprescripts extends VoidTag
+{
+    protected function getName(): string
+    {
+        return 'mprescripts';
+    }
+}
diff --git a/src/Tag/MathML/Ms.php b/src/Tag/MathML/Ms.php
new file mode 100644
index 0000000..0fdcb04
--- /dev/null
+++ b/src/Tag/MathML/Ms.php
@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yiisoft\Html\Tag\MathML;
+
+use Yiisoft\Html\Tag\Base\NormalTag;
+use Yiisoft\Html\Tag\Base\TagContentTrait;
+
+/**
+ * @link https://developer.mozilla.org/en-US/docs/Web/MathML/Element/ms
+ */
+final class Ms extends NormalTag implements MathItemInterface
+{
+    use TagContentTrait;
+
+    public function getName(): string
+    {
+        return 'ms';
+    }
+}
diff --git a/src/Tag/MathML/Msqrt.php b/src/Tag/MathML/Msqrt.php
new file mode 100644
index 0000000..3620830
--- /dev/null
+++ b/src/Tag/MathML/Msqrt.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yiisoft\Html\Tag\MathML;
+
+/**
+ * @link https://developer.mozilla.org/en-US/docs/Web/MathML/Element/msqrt
+ */
+final class Msqrt extends AbstractMathItems
+{
+    protected function getName(): string
+    {
+        return 'msqrt';
+    }
+}
diff --git a/src/Tag/MathML/Msub.php b/src/Tag/MathML/Msub.php
new file mode 100644
index 0000000..f72cf4d
--- /dev/null
+++ b/src/Tag/MathML/Msub.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yiisoft\Html\Tag\MathML;
+
+/**
+ * @link https://developer.mozilla.org/en-US/docs/Web/MathML/Element/msub
+ */
+final class Msub extends AbstractMathItems
+{
+    protected function getName(): string
+    {
+        return 'msub';
+    }
+}
diff --git a/src/Tag/MathML/Msubsup.php b/src/Tag/MathML/Msubsup.php
new file mode 100644
index 0000000..c8ada75
--- /dev/null
+++ b/src/Tag/MathML/Msubsup.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yiisoft\Html\Tag\MathML;
+
+/**
+ * @link https://developer.mozilla.org/en-US/docs/Web/MathML/Element/msubsup
+ */
+final class Msubsup extends AbstractMathItems
+{
+    public function getName(): string
+    {
+        return 'msubsup';
+    }
+}
diff --git a/src/Tag/MathML/Msup.php b/src/Tag/MathML/Msup.php
index 674fd1e..42a22dd 100644
--- a/src/Tag/MathML/Msup.php
+++ b/src/Tag/MathML/Msup.php
@@ -4,14 +4,11 @@
 
 namespace Yiisoft\Html\Tag\MathML;
 
-use Override;
-
 /**
  * @link https://developer.mozilla.org/en-US/docs/Web/MathML/Element/msup
  */
 final class Msup extends AbstractMathItems
 {
-    #[Override]
     protected function getName(): string
     {
         return 'msup';
diff --git a/src/Tag/MathML/Munder.php b/src/Tag/MathML/Munder.php
new file mode 100644
index 0000000..168931e
--- /dev/null
+++ b/src/Tag/MathML/Munder.php
@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yiisoft\Html\Tag\MathML;
+
+/**
+ * @link https://developer.mozilla.org/en-US/docs/Web/MathML/Element/munder
+ */
+final class Munder extends AbstractMathItems
+{
+    protected function getName(): string
+    {
+        return 'munder';
+    }
+
+    public function accentunder(bool $accentunder): self
+    {
+        $new = clone $this;
+        $new->attributes['accentunder'] = $accentunder ? 'true' : 'false';
+
+        return $new;
+    }
+}
diff --git a/tests/Tag/MathML/MmultiscriptsTest.php b/tests/Tag/MathML/MmultiscriptsTest.php
new file mode 100644
index 0000000..068cffc
--- /dev/null
+++ b/tests/Tag/MathML/MmultiscriptsTest.php
@@ -0,0 +1,94 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yiisoft\Html\Tests\Tag\MathML;
+
+use PHPUnit\Framework\TestCase;
+use Yiisoft\Html\Tag\MathML\Mi;
+use Yiisoft\Html\Tag\MathML\Mmultiscripts;
+use Yiisoft\Html\Tag\MathML\Mn;
+use Yiisoft\Html\Tag\MathML\Mprescripts;
+
+final class MmultiscriptsTest extends TestCase
+{
+    public function testSimple(): void
+    {
+        $mmultiscripts = Mmultiscripts::tag()
+            ->base(Mi::tag()->identifier('X'))
+            ->post(
+                Mi::tag()->identifier('a'),
+                Mi::tag()->identifier('b'),
+            )
+            ->pre(
+                Mi::tag()->identifier('c'),
+                Mi::tag()->identifier('d'),
+            );
+
+        $this->assertSame(
+            '<mmultiscripts>' . "\n" .
+            '<mi>X</mi>' . "\n" .
+            '<mi>a</mi>' . "\n" .
+            '<mi>b</mi>' . "\n" .
+            '<mprescripts>' . "\n" .
+            '<mi>c</mi>' . "\n" .
+            '<mi>d</mi>' . "\n" .
+            '</mmultiscripts>',
+            (string) $mmultiscripts
+        );
+    }
+
+    public function testWithoutPre(): void
+    {
+        $mmultiscripts = Mmultiscripts::tag()
+            ->base(Mi::tag()->identifier('X'))
+            ->post(
+                Mi::tag()->identifier('a'),
+                Mi::tag()->identifier('b'),
+            );
+
+        $this->assertSame(
+            '<mmultiscripts>' . "\n" .
+            '<mi>X</mi>' . "\n" .
+            '<mi>a</mi>' . "\n" .
+            '<mi>b</mi>' . "\n" .
+            '</mmultiscripts>',
+            (string) $mmultiscripts
+        );
+    }
+
+    public function testCustomMprescripts(): void
+    {
+        $mmultiscripts = Mmultiscripts::tag()
+            ->base(Mi::tag()->identifier('X'))
+            ->mprescripts(Mprescripts::tag()->id('test-id'))
+            ->post(
+                Mn::tag()->value(1),
+                Mn::tag()->value(2),
+                Mn::tag()->value(3),
+                Mn::tag()->value(4),
+            )
+            ->pre(
+                Mn::tag()->value(5),
+                Mn::tag()->value(6),
+                Mn::tag()->value(7),
+                Mn::tag()->value(8),
+            );
+
+        $this->assertSame(
+            '<mmultiscripts>' . "\n" .
+            '<mi>X</mi>' . "\n" .
+            '<mn>1</mn>' . "\n" .
+            '<mn>2</mn>' . "\n" .
+            '<mn>3</mn>' . "\n" .
+            '<mn>4</mn>' . "\n" .
+            '<mprescripts id="test-id">' . "\n" .
+            '<mn>5</mn>' . "\n" .
+            '<mn>6</mn>' . "\n" .
+            '<mn>7</mn>' . "\n" .
+            '<mn>8</mn>' . "\n" .
+            '</mmultiscripts>',
+            (string) $mmultiscripts
+        );
+    }
+}
diff --git a/tests/Tag/MathML/MoverTest.php b/tests/Tag/MathML/MoverTest.php
new file mode 100644
index 0000000..d30fea8
--- /dev/null
+++ b/tests/Tag/MathML/MoverTest.php
@@ -0,0 +1,56 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yiisoft\Html\Tests\Tag\MathML;
+
+use PHPUnit\Framework\TestCase;
+use Yiisoft\Html\Tag\MathML\Mi;
+use Yiisoft\Html\Tag\MathML\Mo;
+use Yiisoft\Html\Tag\MathML\Mover;
+use Yiisoft\Html\Tag\MathML\Mrow;
+
+final class MoverTest extends TestCase
+{
+    public static function accentDataProvider(): array
+    {
+        return [
+            [true],
+            [false],
+        ];
+    }
+
+    /**
+     * @dataProvider accentDataProvider
+     */
+    public function testMover(bool $accent): void
+    {
+        $mover = Mover::tag()
+            ->accent($accent)
+            ->items(
+                Mrow::tag()
+                    ->items(
+                        Mi::tag()->identifier('x'),
+                        Mo::tag()->operator('+'),
+                        Mi::tag()->identifier('y'),
+                        Mo::tag()->operator('+'),
+                        Mi::tag()->identifier('z'),
+                    ),
+                Mo::tag()->operator('&#x23DE;'),
+            );
+
+        $this->assertSame(
+            '<mover accent="' . ($accent ? 'true' : 'false')  . '">' . "\n" .
+            '<mrow>' . "\n" .
+            '<mi>x</mi>' . "\n" .
+            '<mo>+</mo>' . "\n" .
+            '<mi>y</mi>' . "\n" .
+            '<mo>+</mo>' . "\n" .
+            '<mi>z</mi>' . "\n" .
+            '</mrow>' . "\n" .
+            '<mo>&#x23DE;</mo>' . "\n" .
+            '</mover>',
+            (string) $mover
+        );
+    }
+}
diff --git a/tests/Tag/MathML/MunderTest.php b/tests/Tag/MathML/MunderTest.php
new file mode 100644
index 0000000..96d1a63
--- /dev/null
+++ b/tests/Tag/MathML/MunderTest.php
@@ -0,0 +1,56 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yiisoft\Html\Tests\Tag\MathML;
+
+use PHPUnit\Framework\TestCase;
+use Yiisoft\Html\Tag\MathML\Mi;
+use Yiisoft\Html\Tag\MathML\Mo;
+use Yiisoft\Html\Tag\MathML\Mrow;
+use Yiisoft\Html\Tag\MathML\Munder;
+
+final class MunderTest extends TestCase
+{
+    public static function accentunderDataProvider(): array
+    {
+        return [
+            [true],
+            [false],
+        ];
+    }
+
+    /**
+     * @dataProvider accentunderDataProvider
+     */
+    public function testMunder(bool $accentunder): void
+    {
+        $mover = Munder::tag()
+            ->accentunder($accentunder)
+            ->items(
+                Mrow::tag()
+                    ->items(
+                        Mi::tag()->identifier('x'),
+                        Mo::tag()->operator('+'),
+                        Mi::tag()->identifier('y'),
+                        Mo::tag()->operator('+'),
+                        Mi::tag()->identifier('z'),
+                    ),
+                Mo::tag()->operator('&#x23DE;'),
+            );
+
+        $this->assertSame(
+            '<munder accentunder="' . ($accentunder ? 'true' : 'false')  . '">' . "\n" .
+            '<mrow>' . "\n" .
+            '<mi>x</mi>' . "\n" .
+            '<mo>+</mo>' . "\n" .
+            '<mi>y</mi>' . "\n" .
+            '<mo>+</mo>' . "\n" .
+            '<mi>z</mi>' . "\n" .
+            '</mrow>' . "\n" .
+            '<mo>&#x23DE;</mo>' . "\n" .
+            '</munder>',
+            (string) $mover
+        );
+    }
+}