Document: xmlVersion property

Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

Returns the version number as specified in the XML declaration (e.g., <?xml version="1.0"?>) or "1.0" if the declaration is absent.

This attribute was never really useful, since it always returned 1.0, and has been removed in DOM Level 4. As such, Firefox 10 no longer implements it. Its primary use in the past was to detect whether or not the document was being rendered as XML rather than HTML. To detect this, you can create an element with its name in lower case, then check to see if it gets converted into all upper case (in which case the document is in the non-XML HTML mode):

js
if (document.createElement("foo").tagName === "FOO") {
  /* Document is not XML */
}

Specifications

Specification
DOM
# dom-document-xmlversion

Browser compatibility

desktop mobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
xmlVersion
Deprecated
Chrome – Full support
Chrome 1 (Release date: 2008-12-11)
footnote Full support
Edge – Full support
Edge 12 (Release date: 2015-07-29)
footnote Full support
Firefox – No support
Firefox 1 – 9 (Release date: 2004-11-09)
footnote Removed in 10 and later
Opera – Full support
Opera 15 (Release date: 2013-07-02)
footnote Full support
Safari – Full support
Safari 3 (Release date: 2007-10-26)
footnote Full support
Chrome Android – Full support
Chrome Android 18 (Release date: 2012-06-27)
footnote Full support
Firefox for Android – No support
Firefox for Android 4 – 9 (Release date: 2011-03-29)
footnote Removed in 10 and later
Opera Android – Full support
Opera Android 14 (Release date: 2013-05-21)
footnote Full support
Safari on iOS – Full support
Safari on iOS 1 (Release date: 2007-06-29)
footnote Full support
Samsung Internet – Full support
Samsung Internet 1 (Release date: 2013-04-27)
footnote Full support
WebView Android – Full support
WebView Android 4.4 (Release date: 2013-12-09)
footnote Full support
WebView on iOS – Full support
WebView on iOS 1 (Release date: 2007-06-29)
footnote Full support

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
Deprecated. Not for use in new websites.