code: CssFormatter endBlock() {
          blockDeep--;
          if( blockDeep == 0 ) {
              state.pool.free( insets );
              insets = null;
              inlineMode = false;
          } else {
              if( blockDeep == 1 && currentOutput.getClass() == CssMediaOutput.class ) {
                  state.pool.free( insets );
                  insets = null;
                  inlineMode = false;
              } else {
                  endBlockImpl();
              }
          }
          return this;
      }
docs: Terminate a CSS block.
  
  @return a reference to this object