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    Document.compatMode

    Indicates whether the document is rendered in Quirks mode or Standards mode.

    Syntax

    mode = document.compatMode 
    

    Values

    • "BackCompat" if the document is in quirks mode;
    • "CSS1Compat" if the document is in no-quirks (also known as "standards") mode or limited-quirks (also known as "almost standards") mode.
    mode
    Is an enumerated value that can be:

    Note: all these modes are now defined in standards, so the older "standards" and "almost standards" names are nonsensical and no longer used in standards.

    Example

    if (document.compatMode == "BackCompat") {
      // in Quirks mode
    }
    

    Specifications

    Document Tags and Contributors

    Last updated by: teoli,
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