<annotation>

Baseline 2023
Newly available

Since January 2023, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.

The <annotation> MathML element contains an annotation to the MathML expression in a textual format, for example LaTeX.

Note: Annotations are not supposed to be rendered by browsers and are hidden by default. However, Firefox and Safari render some annotation formats if the first child of the <semantics> element contains errors or is missing.

Attributes

This element's attributes include the global MathML attributes as well as the following attributes:

encoding

The encoding of the semantic information in the annotation (e.g. "application/x-tex")

src Deprecated

The location of an external source for semantic information.

Example

html
<math display="block">
  <semantics>
    <!-- The first child is the MathML expression rendered by default. -->
    <mrow>
      <msup>
        <mi>x</mi>
        <mn>2</mn>
      </msup>
      <mo>+</mo>
      <mi>y</mi>
    </mrow>

    <!-- Annotate with LaTeX, a lightweight markup language. -->
    <annotation encoding="application/x-tex">x^{2} + y</annotation>
  </semantics>
</math>

Technical summary

Specifications

Specification
MathML Core
# semantics-and-presentation

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
annotation

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
No support
No support