The MathML <mstyle> element is used change the style of its children. It accepts all attributes of all MathML presentation elements with some exceptions and additional attributes listed below.



Overall directionality of formulas. Possible values are either ltr (left to right) or rtl (right to left).


A Boolean value specifying whether more vertical space is used for displayed equations or, if set to false, a more compact layout is used to display formulas. The main effect is that larger versions of operators are displayed, when displaystyle is set to true. See also movablelimits on <mo>.


Specifies the default linebreakstyle to use for infix operators. The values before, after and duplicate are allowed.


Controls mostly the font-size. The higher the scriptlevel, the smaller the font size. This attribute accepts a non-negative integer, as well as a "+" or a "-" sign, which increments or decrements the current value. In addition, the scriptlevel attribute can never reduce the font size below scriptminsize in order to avoid unreadable small font sizes and depends on the multiplier specified in scriptsizemultiplier.


Specifies a minimum font size allowed due to changes in scriptlevel. The default value is 8pt.


Specifies the multiplier to be used to adjust font size due to changes in scriptlevel. The default value is 0.71.

The <mstyle> element accepts all attributes of all presentation elements with the following exceptions:


Using displaystyle and mathcolor to effect style changes in the layout of the whole sum.


  <mstyle displaystyle="true" mathcolor="teal">

        <mo stretchy="true" form="prefix">&sum;</mo>
          <mo form="infix">=</mo>

      <mstyle displaystyle="true">




MathML Core
# style-change-mstyle

Browser compatibility

BCD tables only load in the browser

Gecko-specific notes

  • Prior to Gecko 6.0 (Firefox 6.0 / Thunderbird 6.0 / SeaMonkey 2.3) the implementation of <mstyle> was not complete and has been corrected. In particular, setting these attributes on mstyle had no effect to its children:
    • The bevelled attribute on <mfrac> elements.
    • The notation attribute on <menclose> elements.
    • The open, close and separators attributes on <mfenced> elements.
    • The accent and accentunder attributes on <mover>, <munder> and <munderover> elements.
    • The selection attribute on <maction> elements.
    • The mathvariant attribute on <mi> elements.
  • Starting with Gecko 29.0 (Firefox 29.0 / Thunderbird 29.0 / SeaMonkey 2.26), the attributes accepted on the <mstyle> element have been restricted to those actually used in practice: id, class, style, href, mathcolor, mathbackground, scriptlevel, displaystyle, scriptsizemultiplier, scriptminsize, dir, mathsize, mathvariant, fontfamily, fontweight, fontstyle, fontsize, color, background.