Obsolete since Gecko 10.0 (Firefox 10.0 / Thunderbird 10.0 / SeaMonkey 2.7)
This feature is obsolete. Although it is still supported by browsers, its usage is discouraged in new projects. Try to avoid using it.
Returns the encoding as determined by the XML declaration. Should be
null if unspecified or unknown.
If the XML Declaration states:
<?xml version="1.0" encoding="UTF-16"?>
...the result should be "UTF-16".
However, Firefox 3.0 includes information on endianness (e.g., UTF-16BE for big endian encoding), and while this extra information is removed as of Firefox 3.1b3, Firefox 3.1b3 is still consulting the file's encoding, rather than the XML Declaration as the spec defines it ("An attribute specifying, as part of the XML declaration, the encoding of this document.").
- This has been removed from DOM Core Level 4WD