# Command/vphantom

< Command

Revision as of 20:07, 21 August 2021 by BruceH2020 (talk | contribs)

## Contents

# \vphantom

## Summary

The command `\vphantom` creates an invisible item that has height but no width.

## Settings

## Description

`\vphantom` typesets the supplied content and then throws it away, leaving a 'phantom' i.e. an invisible item that has zero width but the maximum height of the phantom text. This then influences the height of what follows.

## Examples

### Aligning the top of square root signs (radicals)

In this example the expressions have been framed to better highlight the differences. The third cube root contains a 'phantom' digit 4 so that its height matches the second one. The first and last don't have this phantom and have a smaller root sign. (Actually, it's the same sized character but lower in the line so it protrudes below the baseline a little.)

\setuppapersize [A7] [A7] \starttext \framed{ \startformula \sqrt[3] {n} \quad \sqrt[3]{4n} \quad \sqrt[3] {\vphantom{4} n} \quad \sqrt[3] {n} \stopformula } \stoptext