code: function (index, blocks, out) {
          var block = blocks[index];
          if (isVoidElement(block.name)) {
            block.closed=true;
          }
          return this._elementOrComponent("element", index, blocks, out);
      }
docs: Manages an element block.
  @param {Array} blocks the full list of blocks.
  @param {Integer} index the index of the block to manage.
  @param {Array} out the output as an array of Node.
  @return {Integer} the index of the block where the function stopped or -1 if all blocks have been handled.