# MathML Fundamentals - The Top-Level math Element 2

MathML specifies a single top-level or root math element, which encapsulates each instance of MathML markup within a document. All other MathML content must be contained in a math element; in other words, every valid MathML expression is wrapped in outer math tags. The math element must always be the outermost element in a MathML expression; it is an error for one math element to contain another. MathML Fundamentals

### $max width - breaking algorithm for long formula$

#### MathML

<math maxwidth="250px" overflow="truncate">
<mtext>max width - breaking algorithm for long formula</mtext>
[/itex]