MathML Fundamentals - Horizontally Group Sub-Expressions mrow

An mrow element is used to group together any number of sub-expressions, usually consisting of one or more mo elements acting as "operators" on one or more other expressions that are their "operands". MathML Fundamentals

Mrow Test left to right a + X X 2 + X 2 + x 2 right to left a + X X 2 + X 2 + x 2 row aligned top a + X X 2 + X 2 + x 2 row aligned bottom a + X X 2 + X 2 + x 2 row aligned axis a + X X 2 + X 2 + x 2 row aligned center a + X X 2 + X 2 + x 2

MathML

<math mathsize="70">
    <mspace linebreak="newline" indentalign="center"></mspace>
    <mtext style="border:1px;" mathsize="50">Mrow Test</mtext>
    <mspace linebreak="newline" indentalign="center"></mspace>
    <mrow style="border:1px;">
        <mtext style="border:1px;">left to right</mtext>
        <mrow style="border:1px;">
            <mtext>a</mtext>
            <mo>+</mo>
            <msup>
                <mi>X</mi>
                <msup>
                    <mi>X</mi>
                    <mn>2</mn>
                </msup>
            </msup>
            <mo>+</mo>
            <msup>
                <mi>X</mi>
                <mn>2</mn>
            </msup>
            <mo>+</mo>
            <msup>
                <mi>x</mi>
                <mn>2</mn>
            </msup>
        </mrow>
    </mrow>
    <mspace linebreak="newline" indentalign="center"></mspace>
    <mrow style="border:1px;">
        <mtext style="border:1px;">right to left</mtext>
        <mrow style="border:1px;" dir="rtl">
            <mtext>a</mtext>
            <mo>+</mo>
            <msup>
                <mi>X</mi>
                <msup>
                    <mi>X</mi>
                    <mn>2</mn>
                </msup>
            </msup>
            <mo>+</mo>
            <msup>
                <mi>X</mi>
                <mn>2</mn>
            </msup>
            <mo>+</mo>
            <msup>
                <mi>x</mi>
                <mn>2</mn>
            </msup>
        </mrow>
    </mrow>
    <mspace linebreak="newline" indentalign="center"></mspace>
    <mrow style="border:1px;">
        <mtext style="border:1px;">row aligned top</mtext>
        <mrow style="border:1px;" rowalign="top">
            <mtext>a</mtext>
            <mo>+</mo>
            <msup>
                <mi>X</mi>
                <msup>
                    <mi>X</mi>
                    <mn>2</mn>
                </msup>
            </msup>
            <mo>+</mo>
            <msup>
                <mi>X</mi>
                <mn>2</mn>
            </msup>
            <mo>+</mo>
            <msup>
                <mi>x</mi>
                <mn>2</mn>
            </msup>
        </mrow>
    </mrow>
    <mspace linebreak="newline" indentalign="center"></mspace>
    <mrow style="border:1px;">
        <mtext style="border:1px;">row aligned bottom</mtext>
        <mrow style="border:1px;" rowalign="bottom">
            <mtext>a</mtext>
            <mo>+</mo>
            <msup>
                <mi>X</mi>
                <msup>
                    <mi>X</mi>
                    <mn>2</mn>
                </msup>
            </msup>
            <mo>+</mo>
            <msup>
                <mi>X</mi>
                <mn>2</mn>
            </msup>
            <mo>+</mo>
            <msup>
                <mi>x</mi>
                <mn>2</mn>
            </msup>
        </mrow>
    </mrow>
    <mspace linebreak="newline" indentalign="center"></mspace>
    <mrow style="border:1px;">
        <mtext style="border:1px;">row aligned axis</mtext>
        <mrow style="border:1px;" rowalign="axis">
            <mtext>a</mtext>
            <mo>+</mo>
            <msup>
                <mi>X</mi>
                <msup>
                    <mi>X</mi>
                    <mn>2</mn>
                </msup>
            </msup>
            <mo>+</mo>
            <msup>
                <mi>X</mi>
                <mn>2</mn>
            </msup>
            <mo>+</mo>
            <msup>
                <mi>x</mi>
                <mn>2</mn>
            </msup>
        </mrow>
    </mrow>
    <mspace linebreak="newline" indentalign="center"></mspace>
    <mrow style="border:1px;">
        <mtext style="border:1px;">row aligned center</mtext>
        <mrow style="border:1px;" rowalign="center">
            <mtext>a</mtext>
            <mo>+</mo>
            <msup>
                <mi>X</mi>
                <msup>
                    <mi>X</mi>
                    <mn>2</mn>
                </msup>
            </msup>
            <mo>+</mo>
            <msup>
                <mi>X</mi>
                <mn>2</mn>
            </msup>
            <mo>+</mo>
            <msup>
                <mi>x</mi>
                <mn>2</mn>
            </msup>
        </mrow>
    </mrow>
</math>