# \allowbreak

Used to explicitly permit a line break at a specific point in inline math expressions.

https://texform.dev/latex/commands/allowbreak

## Metadata

| Field | Value |
| --- | --- |
| Topic | [Layout and breaks](https://texform.dev/latex/topics/layout) |
| Packages | base |
| Allowed mode | math |
| Tags | invisible, spacing |
| Commonality | low |
| Kind | prefix |

## Syntax

### base

Argument specification: ``

Used to explicitly permit a line break at a specific point in inline math expressions.

## Examples

```latex
a \allowbreak b
```

[Open in Playground](https://play.texform.dev/?input=a+%5Callowbreak+b)

## Renderer support

| Package | MathJax | KaTeX | XeTeX |
| --- | --- | --- | --- |
| base | full | full | full |

## Usage frequency

0.01% of formulas in the measured corpus contain this entry, rank 167 of 263 entries with frequency data.

## In TeXForm

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

### [base/allowbreak-drop](https://texform.dev/rules/base/allowbreak-drop)

Drop allowbreak as a pure linebreak hint during cleanup-oriented normalization.

Level: corpus. Fidelity: reading.

```latex
\allowbreak
```

→

```latex

```

```latex
f(x_1)+\allowbreak f(x_2)+f(x_3)
```

→

```latex
f(x_1)+f(x_2)+f(x_3)
```

## Test cases

### base

| Input | Case | MathJax | KaTeX | XeTeX |
| --- | --- | --- | --- | --- |
| \allowbreak | Positive: baseline | Pass | Pass | Pass |