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[Markdown][MathML] Convert MathML to Markdown - DO NOT SQUASH MERGE #9701

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Oct 11, 2021
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[Markdown][MathML] Convert MathML to Markdown - DO NOT SQUASH MERGE #9701

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Rename HTML files to MD
wbamberg Oct 9, 2021
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Convert file contents to Markdown
wbamberg Oct 9, 2021
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---
title: Values
slug: Web/MathML/Attribute/Values
tags:
- Guide
- MathML
- MathML Reference
---
{{MathMLRef}}

## Lengths

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

### Units

| Unit | Description |
| ---- | --------------------------------------------------------------------------------------------------------------------------- |
| `em` | {{ Cssxref("font-size", "Font-relative") }} unit |
| `ex` | {{ Cssxref("font-size", "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. |

### Constants

{{deprecated_header}}

A replacement for the deprecated constants below is:

veryverythinmathspace => 0.05555555555555555em
verythinmathspace => 0.1111111111111111em
thinmathspace => 0.16666666666666666em
mediummathspace => 0.2222222222222222em
thickmathspace => 0.2777777777777778em
verythickmathspace => 0.3333333333333333em
veryverythickmathspace => 0.3888888888888889em

| 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` |

Note: [Namedspace binding is deprecated](https://www.w3.org/TR/MathML3/chapter3.html#id.3.3.4.2.1) in MathML3 and has been removed in Gecko 15.0 {{ geckoRelease("15.0") }} ([bug 673759](https://bugzilla.mozilla.org/show_bug.cgi?id=673759)).
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