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    Indicates whether or not the document is a synthetic one; that is, a document representing a standalone image, video, audio, or the like.


    var isSynthetic = document.mozSyntheticDocument;

    On return, isSynthetic is true if the document is a synthetic one; otherwise it's false.


    This can be useful if you have a contextual menu item you only want to display for synthetic documents (or, conversely, for documents that aren't synthetic).

    var isSynthetic = document.mozSyntheticDocument;
    if (isSynthetic) {
      /* insert your menu item here */


    Not part of any specification.

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    Contributors to this page: Sheppy, teoli, jsx, kscarfone, gurdev_singh
    Last updated by: teoli,
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