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A language attribute on the html tag sets the default natural language for the page. This information can be used for processing the content in various ways, including such things as spell-checking, accessibility, data formatting, and choice of styles for rendering the page. Every page should have the correct default language specified.
For HTML files, this should be a lang attribute. For XHTML served as HTML you should use both the lang and xml:lang attributes. For files served as XML only, you should have xml:lang, but you don't need to have the lang attribute.
What to do
Add a lang attribute that indicates the default language of your page.