2.2.55 [HTML5:2014] Section 7.4 Focus

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C0071: Tracking focus follows platform conventions

The specification states:

 7.4 Focus
     ...
     User agents may track focus for each browsing context or Document individually, or 
     may support only one focused element per top-level browsing context — user agents 
     should follow platform conventions in this regard.

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Tracking focus follows platform conventions.