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Asked: 2026-05-18T03:06:08+00:00

I was wondering what does the xml:lang attribute do and what are it’s values

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I was wondering what does the xml:lang attribute do and what are it’s values in HTML5. and does the xml:lang attribute have any restrictions?

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  1. Editorial Team

    As the standards draft explains in 3.2.3.3 The lang and xml:lang attributes, it is the XML variant of the standard lang attribute, specifying the natural language of the document. It can take any value defined by BCP47. Note however that you may only use the xml:lang attribute if you either have an XML document or also define the lang attribute, and in the latter case they must have the same value. This is because xml:lang is allowed only to ease transition of old XHTML documents:

    Authors must not use the lang attribute in the XML namespace on HTML elements in HTML documents. To ease migration to and from XHTML, authors may specify an attribute in no namespace with no prefix and with the literal localname “xml:lang” on HTML elements in HTML documents, but such attributes must only be specified if a lang attribute in no namespace is also specified, and both attributes must have the same value when compared in an ASCII case-insensitive manner.

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