Fix parsing of <!--<!--!>
Fix parsing of <!--<!--!>

See https://github.com/whatwg/html/issues/2128 Thanks @Ygg01

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