\kern - LaTeX spacing command

\kern 10pt

Renderer support

Package	MathJax	KaTeX	XeTeX
`base`	MathJax: Full	KaTeX: Full	XeTeX: Partial
`textmacros`	MathJax: Full	KaTeX: Full	XeTeX: Partial

Syntax#

\kernm:L{1em}dimension

Argspec m:L — one mandatory argument. Same argspec in base and textmacros. Reading argspecs

base

\kern{10pt}

base

a \kern 2em b

textmacros

\text{\kern 1em}

textmacros

\text{\kern{1em}}

Package	Signature	Allowed mode	Notes
`base`	`m:L`	math	Fine manual spacing or kerning in math where the inserted space should inhibit a line break.
`textmacros`	`m:L`	text	Used for fine horizontal kerning adjustments in text.

TeXForm parses this entry as prefix syntax; the package determines its argument specification.

\mkern 10muapproximate
\mkern is typically used for math units (mu)
\hspace{#1}approximate
\hspace may allow line breaks whereas \kern is typically unbreakable unless followed by glue.

`base`
Input	Case	MathJax	KaTeX	XeTeX
`\kern{1pt}`	Positive · baseline	Pass	Pass	Fail
`\kern 1pt`	Positive · bare[0]	Pass	Pass	Pass
`\kern{a}`	Negative · neg:L[0]	Fail	Fail	Fail

`textmacros`
Input	Case	MathJax	KaTeX	XeTeX
`\kern{1pt}`	Positive · baseline	Pass	Pass	Fail
`\kern 1pt`	Positive · bare[0]	Pass	Pass	Pass
`\kern{a}`	Negative · neg:L[0]	Fail	Fail	Fail