scriptlevel

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

The scriptlevel global attribute sets the math-depth of a MathML element. It allows overriding rules from the user agent stylesheet that define automatic calculation of font-size within MathML formulas.

Syntax

html

<math scriptlevel="-1"> <!-- decrease math-depth by 1 -->
<math scriptlevel="+2"> <!-- increase math-depth by 2 -->
<math scriptlevel="0"> <!-- reset math-depth to 0 -->

Values

If  is an unsigned integer (i.e., with prefix sign symbol removed) then the accepted values are:

: Sets the math-depth to value . This will set font-size of the element to the same value as the one of elements at the specified depth.
+: Sets the math-depth to value add(). This will scale down font-size on the element  times.
-: Sets the math-depth to value add(-). This will scale up font-size on the element  times.

Example

html,
body {
  height: 100%;
}

body {
  display: grid;
  place-items: center;
}

math {
  font-size: 24px;
}

html

<!-- math-depth defaults to 0 on the <math> root. -->
<math>
  <msubsup>
    <!-- math-depth and font-size remain unchanged on the base. -->
    <mtext>base</mtext>
    <!-- math-depth defaults to add(1) within the subscript, so it
         is incremented by 1 and the font-size is scaled down once. -->
    <mtext>subscript</mtext>
    <!-- math-depth defaults to add(1) within the superscript too, but
         the scriptlevel attribute tells to increment it by 2 instead,
         so the font-size is actually scaled down twice. -->
    <mtext scriptlevel="+2">superscript</mtext>
  </msubsup>
</math>