# 在 markdown 编辑器中启用 Tab 键

**URL:** https://meta.discourse.org/t/enabling-the-tab-key-in-markdown-editor/20666
**Category:** Feature
**Tags:** composer
**Created:** [2014年十月1日 16:54 UTC](https://meta.discourse.org/t/enabling-the-tab-key-in-markdown-editor/20666 "2014-10-01T16:54:34Z")
**Posts on this page:** 1
**Showing post:** 8

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### Author: ![codinghorror](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/codinghorror/32/110067_2.png) [@codinghorror](https://meta.discourse.org/u/codinghorror)
#### Post date: [2014年十月3日 21:30 UTC](https://meta.discourse.org/t/enabling-the-tab-key-in-markdown-editor/20666/8 "2014-10-03T21:30:45Z")

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Tab was used to iterate from field to field for as long as I can remember in computer GUIs.

> **[Tab key](https://en.wikipedia.org/wiki/Tab_key#Modern_usage)**
>
> A tab key .mw-parser-output .keyboard-key{border:1px solid #aaa;border-radius:0.2em;box-shadow:0.1em 0.1em 0.2em rgba(0,0,0,0.1);background-color:var(--background-color-neutral-subtle,#f8f9fa);background-image:linear-gradient(to bottom,var(--background-color-neutral,#eaecf0),var(--background-color-neutral-subtle,#f8f9fa),var(--background-color-neutral,#eaecf0));color:var(--color-base,#202122);padding:0.1em 0.3em;font-family:inherit;font-size:0.85em}Tab ↹ is a key on a typical computer or typewrit...

Per Wikipedia, tab as a key to move from field to field in a GUI dates back to at _least_ 1987.

> **[IBM Common User Access](https://en.wikipedia.org/wiki/IBM_Common_User_Access)**
>
> Common User Access (CUA) is a standard for user interfaces to operating systems and computer programs. It was developed by IBM and first published in 1987 as part of their Systems Application Architecture. Used originally in the MVS/ESA, VM/CMS, OS/400, OS/2 and Microsoft Windows operating systems, parts of the CUA standard are now implemented in programs for other operating systems, including variants of Unix. It is also used by Java AWT and Swing.
> IBM wanted a standard way to interact with tex...

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