Frequently Asked Questions for FlightCrew
You probably have an <svg> element as a direct child of the <body> element. That's not allowed (see issue #1 ). Just wrap your <svg> in a <div> and it will validate just fine.
Why does FlightCrew complain about my TrueType font media type? I thought the media type for TT fonts was not standardized.
The de facto standard is "application/x-font-ttf", also recognized by ISO/IEC JTC 1/SC34. FligthCrew enforces the use of that media type since it's an industry best practice. See issue #2 for more details.