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    Several MathML presentation elements have attributes that accept length values used for size or spacing. MathML accepts different units and constants for specifying lengths.


    Unit Description
    em font-relative unit
    ex font-relative unit. (The "x"-height of the element, 1ex ≈ 0.5em in many fonts)
    px Pixels
    in Inches (1 inch = 2.54 centimeters)
    cm Centimeters
    mm Millimeters
    pt Points (1 point = 1/72 inch)
    pc Picas (1 pica = 12 points)
    % Percentage of the default value.


    Constant Value
    veryverythinmathspace 1/18em
    verythinmathspace 2/18em
    thinmathspace 3/18em
    mediummathspace 4/18em
    thickmathspace 5/18em
    verythickmathspace 6/18em
    veryverythickmathspace 7/18em
    Negative contstants are introduced in Gecko 7.0 (Firefox 7.0 / Thunderbird 7.0 / SeaMonkey 2.4) (bug 650530)
    negativeveryverythinmathspace -1/18em
    negativeverythinmathspace -2/18em
    negativethinmathspace -3/18em
    negativemediummathspace -4/18em
    negativethickmathspace -5/18em
    negativeverythickmathspace -6/18em
    negativeveryverythickmathspace -7/18em

    Note: Namedspace binding is deprecated in MathML3 and has been removed in Gecko 15.0 (Firefox 15.0 / Thunderbird 15.0 / SeaMonkey 2.12) (bug 673759).

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    Contributors to this page: Sheppy, fscholz
    Last updated by: Sheppy,