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    <mo>

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    The MathML <mo> element represents an operator in a broad sense. Besides operators in strict mathematical meaning, this element also includes "operators" like parentheses, separators like comma and semicolon, or "absolute value" bars.

    Attributes

    accent
    If the operator is used as an under- or overscript this attribute specifies whether the operator should be treated as an accent.
    Allowed values are true or false.
    class, id, style
    Provided for use with stylesheets.
    dir
    The text direction. Possible values are either ltr (left to right) or rtl (right to left).
    fence
    There is no visual effect for this attribute, but it specifies whether the operator is a fence (such as parentheses).
    Allowed values are true or false.
    form
    Specifies the role of the operator in an enclosed expression, which affects spacing and other default properties. For ordinary operators (+, -, etc. ) you usually do not need to specify this attribute explicitly.
    Possible values are:
    • prefix, for opening fences. (It is the default value if the operator is the first argument in a <mrow> element with more than one argument.)
    • infix, for separators. (It is the default value if the operator is not included in a <mrow> element.)
    • postfix, closing fences. (It is the default value if the operator is the last argument in a <mrow> element with more than one argument.)
    href
    Used to set a hyperlink to a specified URI.
    largeop
    Specifies whether the operator should be drawn larger than normal when displaystyle="true" is set. Allowed values are either true or false.
    lspace
    The amount of space before the operator (see length for values and units). The constant thickmathspace (5/18em) is the default value.
    mathbackground
    The background color. You can use #rgb, #rrggbb and HTML color names.
    mathcolor
    The text color. You can use #rgb, #rrggbb and HTML color names.
    mathsize
    The size of the content. Possible values are:
    • small: Font is rendered smaller than the current font size.
    • normal: Equivalent to 100% or 1em.
    • big: Font is rendered larger than the current font size.
    • a custom length.
    • or a unitless value which multiplies the default.
    mathvariant
    This attribute specifies the logical class of the operator which varies in typography. That is, although the names suggest the typographic style for the class, semantically, items with the same class are treated "the same" within an expression, which might or might not involve displaying them with the named typography. The following values are allowed:
    • normal (Default value) ; Example
    • bold ; Example
    • italic ; Example
    • bold-italic ; Example
    • double-struck ; Example
    • bold-fraktur ; Example
    • script ; Example
    • bold-script ; Example
    • fraktur ; Example
    • sans-serif ; Example
    • bold-sans-serif ; Example
    • sans-serif-italic ; Example
    • sans-serif-bold-italic ; Example
    • monospace ; Example
    • initial ; مثال
    • tailed ; مثال
    • looped ; مثال
    • stretched ; مثال
    maxsize
    If stretchy is true, this attribute specifies the maximum size of the operator. Allowed values are:
    • infinity
    • an arbitrary length
    minsize
    If stretchy is true, this attribute specifies the minimum size of the operator. Allowed values are:
    • infinity
    • an arbitrary length
    movablelimits
    Specifies whether attached under- and overscripts move to sub- and superscript positions when displaystyle is false.
    Allowed values are either true or false.
    rspace
    The amount of space after the operator (see length for values and units). The constant thickmathspace (5/18em) is the default value.
    separator
    There is no visual effect for this attribute, but it specifies whether the operator is a separator (such as commas).
    Allowed values are true or false.
    stretchy
    Specifies whether the operator stretches to the size of the adjacent element.
    Allowed values are true or false.
    symmetric
    If stretchy is true, this attribute specifies whether the operator should be vertically symmetric around the imaginary math axis (centered fraction line).
    The default value is true if stretchy is set to true and otherwise false. Allowed values are true or false.

    Examples

    <math>
    
    <mrow>
      <mn>5</mn>
      <mo>+</mo>
      <mn>5</mn>
    </mrow> 
    
    <mrow>
      <mo> [ </mo> <!-- default form value: prefix --> 
      <mrow>
        <mn> 0 </mn>
        <mo> ; </mo> <!-- default form value: infix --> 
        <mn> 1 </mn>
      </mrow>
      <mo> ) </mo> <!-- default form value: postfix -->
    </mrow>
    
    </math>
    

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support Not supported (24 only) 1.0 (1.7 or earlier) Not supported 9.5 5.1
    accent Not supported 1.0 (1.7 or earlier) Not supported Not supported Not supported
    dir Not supported 12.0 (12.0) Not supported Not supported Not supported
    form Not supported Not supported bug 562460 Not supported 9.5 Not supported
    href Not supported WebKit bug 85733 7.0 (7.0) Not supported Not supported Not supported WebKit bug 85733
    largeop Not supported Not supported Not supported 9.5 Not supported
    lspace, rspace Not supported 1.0 (1.7 or earlier) Not supported Not supported Not supported
    mathsize Not supported (24 only) 1.0 (1.7 or earlier) Not supported Not supported 5.1
    mathvariant Not supported (24 only) 28.0 (28.0) Not supported partially supported (see above) partially supported (see above)
    maxsize, minsize Not supported 1.0 (1.7 or earlier) Not supported Not supported Not supported
    movablelimits Not supported 1.0 (1.7 or earlier) Not supported Not supported Not supported
    stretchy Not supported (24 only) 1.0 (1.7 or earlier) Not supported Not supported 5.1
    symmetric Not supported 1.0 (1.7 or earlier) Not supported Not supported Not supported
    Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support Not supported Not supported 1.0 (1.9.2) Not supported Not supported Not supported
    accent Not supported Not supported 1.0 (1.9.2) Not supported Not supported Not supported
    dir Not supported Not supported 12.0 (12.0) Not supported Not supported Not supported
    form Not supported Not supported Not supported bug 562460 Not supported Not supported Not supported
    href Not supported Not supported 7.0 (7.0) Not supported Not supported Not supported
    largeop Not supported Not supported Not supported Not supported Not supported Not supported
    lspace, rspace Not supported Not supported 1.0 (1.9.2) Not supported Not supported Not supported
    mathsize Not supported Not supported 1.0 (1.9.2) Not supported Not supported Not supported
    mathvariant Not supported Not supported 28.0 (28.0) Not supported Not supported Not supported
    maxsize, minsize Not supported Not supported 1.0 (1.9.2) Not supported Not supported Not supported
    movablelimits Not supported Not supported 1.0 (1.9.2) Not supported Not supported Not supported
    stretchy Not supported Not supported 1.0 (1.9.2) Not supported Not supported Not supported
    symmetric Not supported Not supported 1.0 (1.9.2) Not supported Not supported Not supported
    Note: Any linebreaking or indentation attributes are not implemented yet. For Gecko see bug 534962.

    Gecko-specific notes

    • Starting with Gecko 16.0 (Firefox 16.0 / Thunderbird 16.0 / SeaMonkey 2.13) the default values for lspace and rspace have been corrected to match the MathML3 specification. They now default to the constant thickmathspace (5/18em).
    • Starting with Gecko 20.0 (Firefox 20.0 / Thunderbird 20.0 / SeaMonkey 2.17) a unitless value for mathsize is allowed.
    • Some mathvariant values are only implemented starting with Gecko 28.0 (Firefox 28.0 / Thunderbird 28.0 / SeaMonkey 2.25) and require appropriate math fonts.

    Specifications

    Specification Status Comment
    MathML 3.0 Recommendation Current specification
    MathML 2.0 Recommendation Initial specification

     

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