We're looking for a person or people to help audit MDN to find places we could speed up. Is this you or someone you know? Check out the RFP: https://mzl.la/2IHcMiE


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.

Document Tags and Contributors

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