flexbox

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noun

A CSS3 layout model that allows elements on a web page to be arranged in certain ways within a one-dimensional container.

“Internet Explorer 9 does not support flexbox.”

Scrabble 26

Meanings

nounflexbox (countable and uncountable, plural flexboxes)

plural flexboxes · alternative flex box · alternative flex-box

  1. uncountableweb developmentA CSS3 layout model that allows elements on a web page to be arranged in certain ways within a one-dimensional container.

    Internet Explorer 9 does not support flexbox.

  2. countableweb developmentAn HTML element that uses this model.

    You can nest flexboxes inside each other.

    2014, Andy Harris, HTML5 and CSS3 All-in-One For Dummies
    2 more examples

    The contents of a flexbox can be positioned in any direction, can have their order swapped dynamically, and can auto-adjust their sizes and positions based on available space.

    2012, Sergey Mavrody, Nika Mavrody, Sergey's HTML5 & CSS3: Quick Reference, page 112

    There's still quite a bit of tumult in the standards recommendations and implementations for flexboxes, but IE10 and Windows 8 has a good, solid implementation of this extremely helpful layout technique.

    2013, Jeremy Foster, CSS for Windows 8 App Development, page 161

Origin

Cite this entry
APA

flexbox. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/flexbox

MLA

“flexbox.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/flexbox. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “flexbox,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/flexbox.

Source: flexbox on Wiktionary, CC BY-SA 4.0.