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==Next==
== Color ==
Equations can use color with the <code>\color</code> command. The default [[Wikipedia:Texvc|Texvc]] renderer and the [[MathJax]] renderers have different syntaxes to support both use <code>{\color{Blue}{text}}</code>. For example
* <source lang="text" enclose="none">{\color{Blue}{x^2}}+{\color{Orange}{2x}}-{\color{LimeGreen}{1}}</source>
*: <math>{\color{Blue}{x^2}}+{\color{Orange}{2x}}-{\color{LimeGreen}{1}}</math>
* <source lang="text" enclose="none">x_{1,2}=\frac{{\color{Blue}{-b}}\pm\sqrt{\color{Red}{b^2-4ac}}}{\color{Green}{2a}}</source>
*: <math>x_{1,2}=\frac{{\color{Blue}{-b}}\pm\sqrt{\color{Red}{b^2-4ac}}}{\color{Green}{2a}}</math>
There are several alternate notations styles
* <source lang="text" enclose="none">{\color{Blue}x^2}+{\color{Orange}2x}-{\color{LimeGreen}1}</source> works with both texvc and MathJax
*: <math>{\color{Blue}x^2}+{\color{Orange}2x}-{\color{LimeGreen}1}</math>
* <source lang="text" enclose="none">\color{Blue}x^2\color{Black}+\color{Orange}2x\color{Black}-\color{LimeGreen}1</source> works with both texvc and MathJax
*: <math>\color{Blue}x^2\color{Black}+\color{Orange}2x\color{Black}-\color{LimeGreen}1</math>
* <source lang="text" enclose="none">\color{Blue}{x^2}+\color{Orange}{2x}-\color{LimeGreen}{1}</source> only works with MathJax
*: <math>\color{Blue}{x^2}+\color{Orange}{2x}-\color{LimeGreen}{1}</math>
Some color names are predeclared according to the following table, you can use them directly for the rendering of formulas (or for declaring the intended color of the page background).
{| class="wikitable"
|+ Colors supported
|-
| <math>\color{Blue}{\text{Blue}}</math> || <math>\color{BlueGreen}{\text{BlueGreen}}</math> || <math>\color{BlueViolet}{\text{BlueViolet}}</math> || <math>\color{BrickRed}{\text{BrickRed}}</math>
|-
| <math>\color{Brown}{\text{Brown}}</math> || <math>\color{BurntOrange}{\text{BurntOrange}}</math> || <math>\color{CadetBlue}{\text{CadetBlue}}</math> || <math>\color{CarnationPink}{\text{CarnationPink}}</math>
|-
| <math>\color{DarkOrchid}{\text{DarkOrchid}}</math> || <math>\color{Emerald}{\text{Emerald}}</math> || <math>\color{ForestGreen}{\text{ForestGreen}}</math> || <math>\color{Fuchsia}{\text{Fuchsia}}</math>
|-
| <math>\color{Mahogany}{\text{Mahogany}}</math> || <math>\color{Maroon}{\text{Maroon}}</math> || <math>\color{Melon}{\text{Melon}}</math> || <math>\color{MidnightBlue}{\text{MidnightBlue}}</math>
|-
| <math>\color{Mulberry}{\text{Mulberry}}</math> || <math>\color{NavyBlue}{\text{NavyBlue}}</math> || <math>\color{OliveGreen}{\text{OliveGreen}}</math> || <math>\color{Orange}{\text{Orange}}</math>
|-
| <math>\color{OrangeRed}{\text{OrangeRed}}</math> || <math>\color{Orchid}{\text{Orchid}}</math> || <math>\color{Peach}{\text{Peach}}</math> || <math>\color{Periwinkle}{\text{Periwinkle}}</math>
|-
| <math>\color{PineGreen}{\text{PineGreen}}</math> || <math>\color{Plum}{\text{Plum}}</math> || <math>\color{ProcessBlue}{\text{ProcessBlue}}</math> || <math>\color{Purple}{\text{Purple}}</math>
|-
| <math>\color{RawSienna}{\text{RawSienna}}</math> || <math>\color{Red}{\text{Red}}</math> || <math>\color{RedOrange}{\text{RedOrange}}</math> || <math>\color{RedViolet}{\text{RedViolet}}</math>
|-
| <math>\color{Rhodamine}{\text{Rhodamine}}</math> || <math>\color{RoyalBlue}{\text{RoyalBlue}}</math> || <math>\color{RoyalPurple}{\text{RoyalPurple}}</math> || <math>\color{RubineRed}{\text{RubineRed}}</math>
|-
| <math>\color{Salmon}{\text{Salmon}}</math> || <math>\color{SeaGreen}{\text{SeaGreen}}</math> || <math>\color{Sepia}{\text{Sepia}}</math> || <math>\color{SkyBlue}{\text{SkyBlue}}</math>
|}
Note that color should not be used as the ''only'' way to identify something, because it will become meaningless on black-and-white media or for color-blind people. See [[Wikipedia:Manual of Style (accessibility)#Color]].
Custom colours can be defined using
<syntaxhighlight lang="latex">\definecolor{myorange}{RGB}{255,165,100}\color{myorange}e^{i \pi}\color{Black} + 1 = 0</syntaxhighlight>
:<math>\definecolor{myorange}{RGB}{255,165,100}\color{myorange}e^{i \pi}\color{Black} + 1 = 0</math>
== Formatting issues ==
=== Spacing ===
Note that {{TeX}} handles most spacing automatically, but you may sometimes want manual control.
{| class="wikitable"
! Feature
! Syntax
! How it looks rendered
|-
| double quad space
| <source lang="latex" enclose="none">a \qquad b</source>
| <math>a \qquad b</math>
|-
| quad space
| <source lang="latex" enclose="none">a \quad b</source>
| <math>a \quad b</math>
|-
| text space
| <source lang="latex" enclose="none">a\ b</source>
| <math>a\ b</math>
|-
| text space without PNG conversion
| <source lang="latex" enclose="none">a \mbox{ } b</source>
| <math>a \mbox{ } b</math>
|-
| large space
| <source lang="latex" enclose="none">a\;b</source>
| <math>a\;b</math>
|-
| medium space
| <source lang="latex" enclose="none">a\<b</source>
| [not supported]
|-
| small space
| <source lang="latex" enclose="none">a\,b</source>
| <math>a\,b</math>
|-
| tiny space (use for multiplication of factors)
| <source lang="latex" enclose="none">ab</source>
| <math>ab</math>
|-
| no space (use for multi-letter variables)
| <source lang="latex" enclose="none">\mathit{ab}</source>
| <math>\mathit{ab}</math>
|-
| small negative space
| <source lang="latex" enclose="none">a\!b</source>
| <math>a\!b</math>
|}
Automatic spacing may be broken in very long expressions (because they produce an overfull hbox in {{TeX}}):
: <source lang="latex" enclose="none">0+1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+\cdots</source>
: <math>0+1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+\cdots</math>
This can be remedied by putting a pair of braces { } around the whole expression:
: <source lang="latex" enclose="none">{0+1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+\cdots}</source>
: <math>{0+1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+\cdots}</math>
=== Alignment with normal text flow ===
Due to the default CSS
<source lang="CSS">img.tex { vertical-align: middle; }</source>
an inline expression like <math>\int_{-N}^{N} e^x\, dx</math> should look good.
If you need to align it otherwise, use <code><nowiki><math style="vertical-align:-100%;">...</math></nowiki></code> and play with the <source lang="latex" enclose="none">vertical-align</source> argument until you get it right; however, how it looks may depend on the browser and the browser settings.
Also note that if you rely on this workaround, if/when the rendering on the server gets fixed in future releases, as a result of this extra manual offset your formulae will suddenly be aligned incorrectly. So use it sparingly, if at all.