coderef

<dfn>Baseline · Widely available

The &#x3C;dfn> element marks a term to be defined, styling text as italic by default.

Supported in all major browsers for at least 30 months — safe to use without fallbacks. Baseline since Jul 29, 2015. Widely available since Jan 29, 2018.

How to use ↓Compare browsers

Browser support

DesktopChrome
1–14Not supported
15+Supportedsince Oct 25, 2011
Current: 155
Edge
12+Supportedsince Jul 29, 2015
Current: 154
Firefox
1+Supportedsince Nov 9, 2004
Current: 157
Safari
1–5.1Not supported
6+Supportedsince Jul 25, 2012
Current: 27
MobileChrome Android
18+Supportedsince Jun 27, 2012
Current: 155
Firefox Android
4+Supportedsince Mar 29, 2011
Current: 157
Safari iOS
1–5Not supported
6+Supportedsince Sep 10, 2012
Current: 27

How to use

This feature is Baseline widely available — use it freely, no fallback needed.

Example

Full syntax and examples are on MDN: dfn.

Feature detection

JS · check before using
const el = document.createElement("dfn");
if (!(el instanceof HTMLUnknownElement)) {
  // <dfn> is supported
}

Documentation (MDN)

Specification