@p Offset can be zero, positive, or negative. If @p offset is zero,
then the start of the content will be returned. If @p offset is positive,
then a pointer to @p offset number of characters from the beginning of the
@p Offset can be zero, positive, or negative. If @p offset is zero,
then the start of the content will be returned. If @p offset is positive,
then a pointer to @p offset number of characters from the beginning of the