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In addition to CSS data types, some MathML attributes accept the following types:
<unsigned-integer>: An <integer>, whose first character is neither U+002D HYPHEN-MINUS character (-) nor U+002B PLUS SIGN (+); for example 1234.<boolean>: A string true or false representing a boolean value.Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
Instead of <length-percentage>, MathML used to define its own type to describe lengths. Accepted values included non-zero unitless length values (e.g., 5 to mean 500%), values containing numbers ending with a dot (e.g., 34.px), or named spaces (e.g., thinmathspace). For compatibility reasons, it is recommended to replace non-zero unitless length values with equivalent <percentage> values, to remove unnecessary dots in numbers, and to use the following replacement for named lengths:
veryverythinmathspace => 0.05555555555555555em verythinmathspace => 0.1111111111111111em thinmathspace => 0.16666666666666666em mediummathspace => 0.2222222222222222em thickmathspace => 0.2777777777777778em verythickmathspace => 0.3333333333333333em veryverythickmathspace => 0.3888888888888889em
| 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 |
1/18 em |
verythinmathspace |
2/18 em |
thinmathspace |
3/18 em |
mediummathspace |
4/18 em |
thickmathspace |
5/18 em |
verythickmathspace |
6/18 em |
veryverythickmathspace |
7/18 em |
negativeveryverythinmathspace |
-1/18 em |
negativeverythinmathspace |
-2/18 em |
negativethinmathspace |
-3/18 em |
negativemediummathspace |
-4/18 em |
negativethickmathspace |
-5/18 em |
negativeverythickmathspace |
-6/18 em |
negativeveryverythickmathspace |
-7/18 em |
This page was last modified on Nov 6, 2025 by MDN contributors.
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