index.md

---

title: <merror>
slug: Web/MathML/Element/merror
browser-compat: mathml.elements.merror

---

{{MathMLRef}}

The <merror> MathML element is used to display contents as error messages. The intent of this element is to provide a standard way for programs that generate MathML from other input to report syntax errors.

Attributes

This element accepts the global MathML attributes.

Examples

In the following example, <merror> is used to indicate a parsing error for some LaTeX-like input:

<math display="block">
  <mfrac>
    <merror>
      <mtext>Syntax error: \frac{1}</mtext>
    </merror>
    <mn>3</mn>
  </mfrac>
</math>

{{ EmbedLiveSample('merror_example', 700, 200, "", "") }}

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}