title: iOS, why is the sizing class for regular / regular 800 x 800?
body: <p>I'm trying to use some proportional sizing constraints.</p>
  
  <p>This seems to differ on iPad pro and iPad 2.</p>
  
  <p>It doesn't make any sense that the regular / regular sizing class is 800 x 800.
  None of the iPad are this size.</p>