docs: function (mml) {
        this.UncollapseChild(mml,1);
        if (mml.complexity > this.COLLAPSE.fenced) {
          if (mml.attr["data-semantic-role"] === "leftright") {
            var marker = mml.data[0].data.join("") + mml.data[mml.data.length-1].data.join("");
            mml = this.MakeAction(this.Marker(marker),mml);
          }
        }
        return mml;
      }