Errors on @font-face CSS declaration Follow

Let's say I do this in a CSS file:

@font-face {
   font-family: Treefrog;
   src: url('/Content/Fonts/treefrog.eot'); /* IE */
   src: local('Treefrog'), url('/Content/Fonts/treefrog.ttf') format("truetype"); /* non-IE */
}

This is how the @font-face declaration is supposed to be written, but ReSharper complains about the "local" and "format" declarations.