Correct tokenizing of `<!--<!-`
Correct tokenizing of `<!--<!-`

See https://github.com/whatwg/html/pull/1356#issuecomment-225839546

takenspc/validator,takenspc/validator,validator/validator,tripu/validator,validator/validator,tripu/validator,tripu/validator,takenspc/validator,tripu/validator,validator/validator,validator/validator,takenspc/validator,tripu/validator,takenspc/validator,validator/validator