MathML Fundamentals - Attributes Shared by all MathML Elements Width

In addition to the attributes described specifically for each element, the attributes: id, xref, class, style and href are allowed on every MathML element. MathML Fundamentals

+ very long + + very long very long + + very long + + very long very long + + very long + + very long very long +

MathML

<math display="block">
    <mspace linebreak="newline"></mspace>
    <mrow  style="border:1px;">
		<mspace linebreak="newline"></mspace>
		<mrow style="border:1px">
			<mo style="border:2px">→</mo>
			<mo>+</mo>
		</mrow>
		<mspace linebreak="newline"></mspace>
		<mrow style="border:1px">
            <mi>very long</mi>
			<mo>+</mo>
			<mo style="border:2px">→</mo>
			<mo>+</mo>
            <mi>very long</mi>
		</mrow>
		<mspace linebreak="newline"></mspace>
		<mrow style="border:1px">
            <mi>very long</mi>
			<mo>+</mo>
			<mo style="border:2px">→</mo>
		</mrow>
    </mrow>

    <mspace linebreak="newline"></mspace>
    <mrow  style="border:1px;width:600px">
		<mspace linebreak="newline"></mspace>
		<mrow style="border:1px">
			<mo style="border:2px">→</mo>
			<mo>+</mo>
		</mrow>
		<mspace linebreak="newline"></mspace>
		<mrow style="border:1px">
            <mi>very long</mi>
			<mo>+</mo>
			<mo style="border:2px">→</mo>
			<mo>+</mo>
            <mi>very long</mi>
		</mrow>
		<mspace linebreak="newline"></mspace>
		<mrow style="border:1px">
            <mi>very long</mi>
			<mo>+</mo>
			<mo style="border:2px">→</mo>
		</mrow>
    </mrow>

    <mspace linebreak="newline"></mspace>
    <mrow  style="border:1px;width:800px">
		<mspace linebreak="newline"></mspace>
		<mrow style="border:1px">
			<mo style="border:2px">→</mo>
			<mo>+</mo>
		</mrow>
		<mspace linebreak="newline"></mspace>
		<mrow style="border:1px">
            <mi>very long</mi>
			<mo>+</mo>
			<mo style="border:2px">→</mo>
			<mo>+</mo>
            <mi>very long</mi>
		</mrow>
		<mspace linebreak="newline"></mspace>
		<mrow style="border:1px">
            <mi>very long</mi>
			<mo>+</mo>
			<mo style="border:2px">→</mo>
		</mrow>
    </mrow>

</math>