MDN may have intermittent access issues April 18 13:00 - April 19 01:00 UTC. See for all notifications.

Your Search Results


    The Standard Generalized Markup Language (SGML) is an ISO specification made for defining declarative markup languages.

    On the web, HTML 4, XHTML, and XML are popular SGML-based languages. It is worth noting that since its fifth edition, HTML is no longer SGML-based and has its own parsing rules.

    Learn more

    Document Tags and Contributors

    Contributors to this page: Biraj, Jeremie, andy1633, klez, teoli, Andrew_Pfeiffer, avsaro
    Last updated by: andy1633,