2.1.12 [HTML5:2014] Section 3.2.5.6 The dir attribute

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V0021: The auto keyword is not supported

The specification states:

 ... The dir attribute
  
     The dir attribute specifies the element’s text directionality. The attribute is an 
     enumerated attribute with the following keywords and states:
         ...
         The auto keyword, which maps to the auto state
  
             Indicates that the contents of the element are explicitly directionally 
             isolated text, but that the direction is to be determined programmatically 
             using the contents of the element (as described below).

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The auto keyword is not supported.