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---
title: "Flex - Glossary | MDN"
chunk: 1/3
source: "https://developer.mozilla.org/en-US/docs/Glossary/Flex"
category: "reference"
tags: "web, html, css, javascript, documentation"
date_saved: "2026-05-05T05:31:45.904848+00:00"
instance: "kb-cron"
---
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1. [Glossary](https://developer.mozilla.org/en-US/docs/Glossary)
2. [Flex](https://developer.mozilla.org/en-US/docs/Glossary/Flex)
# Flex
`flex` is a value of the CSS [`display`](https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/display) property. Along with `inline-flex`, it causes the element it applies to become a [flex container](https://developer.mozilla.org/en-US/docs/Glossary/Flex_Container), and the element's children to each become a [flex item](https://developer.mozilla.org/en-US/docs/Glossary/Flex_Item). The items then participate in flex layout, and all of the properties defined in the [CSS flexible box layout module](https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Flexible_box_layout) may be applied.
There is also a [`flex`](https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/flex) property, which is a shorthand for the flexbox properties [`flex-grow`](https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/flex-grow), [`flex-shrink`](https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/flex-shrink) and [`flex-basis`](https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/flex-basis). This property is only applicable to flex containers.
In addition [`<flex>`](https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/flex_value) can refer to a [flexible length](https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/flex_value) in CSS Grid Layout.
## In this article
* [Related CSS properties](https://developer.mozilla.org/en-US/docs/Glossary/Flex#related_css_properties)
* [See also](https://developer.mozilla.org/en-US/docs/Glossary/Flex#see_also)
## [Related CSS properties](https://developer.mozilla.org/en-US/docs/Glossary/Flex#related_css_properties)
* [`align-content`](https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/align-content)
* [`align-items`](https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/align-items)
* [`align-self`](https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/align-self)
* [`flex`](https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/flex)
* [`flex-basis`](https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/flex-basis)
* [`flex-direction`](https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/flex-direction)
* [`flex-flow`](https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/flex-flow)
* [`flex-grow`](https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/flex-grow)
* [`flex-shrink`](https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/flex-shrink)
* [`flex-wrap`](https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/flex-wrap)
* [`gap`](https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/gap)
* [`justify-content`](https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/justify-content)
* [`order`](https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/order)
* [`place-items`](https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/place-items)
* [`place-self`](https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/place-self)
## [See also](https://developer.mozilla.org/en-US/docs/Glossary/Flex#see_also)
* [Basic concepts of flexbox](https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Flexible_box_layout/Basic_concepts)
* [Relationship of flexbox to other layout methods](https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Flexible_box_layout/Relationship_with_other_layout_methods)
* [Aligning items in a flex container](https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Flexible_box_layout/Aligning_items)
* [Ordering flex items](https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Flexible_box_layout/Ordering_items)
* [Controlling ratios of flex items along the main axis](https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Flexible_box_layout/Controlling_flex_item_ratios)
* [Mastering wrapping of flex items](https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Flexible_box_layout/Wrapping_items)
* [Typical use cases of flexbox](https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Flexible_box_layout/Use_cases)
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