2.2.57 [HTML5:2014] Section 7.4.4 Element-level focus APIs

C0074: The blur function is not ignored on elements but is ignored on the window object

The specification states:

 ... ...
     ...
     The blur() method, when invoked, should run the unfocusing steps for the element on 
     which the method was called ... . User agents may selectively or uniformly ignore 
     calls to this method for usability reasons.

All document modes (All versions)

The blur function is not ignored on elements but is ignored on the window object.