title: array.map function not supported in IE8 standards?
body: <p>I don't have IE8 so I am testing IE8 from within IE10. When I switch to "IE8 standards" for document mode, the javascript map function of an array object gives a javascript error: Object doesn't support property or method 'map'</p>
  
  <p>but when I switch to "Standards" for document mode, there's no error. Which mode should I test under?</p>
  
  <p>If IE8 doesn't support the map function, is there a way to emulate it?</p>