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    <dfn>

    Summary

    The HTML Definition Element (<dfn>) represents the defining instance of a term.

    HTML5 Usage Notes:
    • The <dfn> element marks the term being defined; the definition of the term should be given by the surrounding <p>, <section> or definition list group (usually a <dt>, <dd> pair).
    • The exact value of the term being defined is determined by the following rules:
      1. If the <dfn> element has a title attribute, then the term is the value of that attribute.
      2. Else, if it contains only an <abbr> element with a title attribute, then the term is the value of that attribute.
      3. Otherwise, the text content of the <dfn> element is the term being defined.

    Attributes

    This element includes the global attributes.

    In HTML5, the title attribute has special meaning, as noted above.

    Examples

    The following examples are valid in HTML5.

    <!-- Define "The Internet" -->
    <p><dfn id="def-internet">The Internet</dfn> is a global system of interconnected networks that use the Internet Protocol Suite (TCP/IP) to serve billions of users worldwide.</p>
    

    Later in the same document:

    <dl>
      <!-- Define "World-Wide Web" and reference definition for "the Internet" -->
      <dt>
        <dfn>
          <abbr title="World-Wide Web">WWW</abbr>
        </dfn>
      </dt>
      <dd>The World-Wide Web (WWW) is a system of interlinked hypertext documents accessed on <a href="#def-internet">the Internet</a>.</dd>
    </dl>
    

    Result

    The Internet is a global system of interconnected networks that use the Internet Protocol Suite (TCP/IP) to serve billions of users worldwide.

    WWW
    The World-Wide Web (WWW) is a system of interlinked hypertext documents accessed on the Internet.

    Specifications

    Specification Status Comment
    WHATWG HTML Living Standard
    The definition of '<dfn>' in that specification.
    Living Standard  
    HTML5
    The definition of '<dfn>' in that specification.
    Recommendation  
    HTML 4.01 Specification
    The definition of '<dfn>' in that specification.
    Recommendation  

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support (Yes) 1.0 (1.7 or earlier) (Yes) (Yes) (Yes)
    Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support (Yes) 1.0 (1.0) (Yes) (Yes) (Yes)

    See also

    Document Tags and Contributors

    Last updated by: Jeremie,