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Editorial Team
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Asked: 2026-05-12T16:48:40+00:00

I have a XHTML document and want to embed XUL widgets into the document.

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I have a XHTML document and want to embed XUL widgets into the document. What is the correct XML syntax to do so?

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>  
</head>
  <body>    
  insert XUL here
  </body>
</html>
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1 Answer

  1. Editorial Team

    add xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" to your <html> tag.

    then use <xul:element>, e.g. <xul:vbox>

    Edit

    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" 
      xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
      xml:lang="en" lang="en">
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>  
</head>
  <body>    
    <xul:vbox>
    </xul:vbox>
  </body>
</html>

    Also, I assume this isn’t such a simple case… otherwise there wouldn’t be much point in wrapping the xul in html (though the other way around does happen sometimes)

    Edit

    Some additional points to keep in mind when doing this:

    1. must be served with a valid xml type. e.g. application/xml or text/xml — not text/html. (See https://bugzilla.mozilla.org/show_bug.cgi?id=101147#c12 — the whole thread is worth a read)
    2. must be valid xml. A certain degree of sloppiness is tolerated by browsers when parsing html (unclosed tags, etc.) and this is not that case for a document containing xul (even the html parts of the document)

    (thanks to Nikolay for the first point)

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