function testPropsAll( prop, prefixed ) {

        var ucProp  = prop.charAt(0).toUpperCase() + prop.substr(1),
            props   = (prop + ' ' + domPrefixes.join(ucProp + ' ') + ucProp).split(' ');

        return testProps(props, prefixed);
    }
testPropsAll tests a list of DOM properties we want to check against.
  We specify literally ALL possible (known and/or likely) properties on
  the element including the non-vendor prefixed one, for forward-
  compatibility.