2.2.5 [W3C-HTML51] Section 3.2.5.3 The lang and xml:lang attributes

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C0007: The lang attribute is used to determine which fonts and quotes to use within a document

The specification states:

 ... The lang and xml:lang attributes
     ...
     User agents may use the element's language to determine proper processing or 
     rendering (e.g. in the selection of appropriate fonts or pronunciations, for 
     dictionary selection, or for the user interfaces of form controls such as date 
     pickers).

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The lang attribute is used to determine which fonts and quotes to use within a document.